Herbicide composition

Abstract

To provide a herbicide composition that has both immediate effect and persistence when used after being diluted with water, and is stable in both the state at the time of sale and the state at the time of use.SOLUTION: Provided is a liquid herbicidal composition to be diluted with water, in which a herbicidal active ingredient containing pelargonic acid and glyphosate salt, any one or more cationic surfactant selected from monoalkyl type cationic surfactant and dialkyl type cationic surfactant, and water are contained, and is transparent or translucent and the herbicidally active ingredient is uniformly dispersed.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a herbicide composition, and particularly belongs to the technical field of containing pelargonic acid and glyphosate salts. More specifically, the present invention relates to a herbicide composition having quick-acting and residual effects and excellent daily stability even when containing both pelargonic acid and glyphosate salts.

Background Art

[0002] Fatty acids having 6 to 12 carbon atoms, particularly pelargonic acid having 9 carbon atoms (common name Pelargonic acid, IUPAC name Nonanoic acid), are compounds having safe and quick-acting herbicidal activity and are widely used worldwide (Patent Document 1).

[0003] In addition, since pelargonic acid is also used as a food additive, it has attracted attention as a herbicidal active ingredient with a safe image, and the need for herbicides using pelargonic acid is increasing. Pelargonic acid is a hydrophobic substance with a solubility in water of 32 ppm (30 °C). In the development of herbicides using pelargonic acid, a technique for solubilizing or emulsifying pelargonic acid is required.

[0004] For example, Patent Document 1 discloses a formulation technique in which the main solvent is water and an anionic surfactant and a nonionic surfactant are used in combination to stably present pelargonic acid in water as an acid.

[0005] In addition, Patent Document 2 discloses a technique for emulsifying pelargonic acid using a quaternary ammonium salt as a surfactant.

[0006] On the other hand, Patent Documents 3 and 4 disclose formulations in which the water solubility of pelargonic acid is improved by neutralizing it with an organic base.

Prior Art Documents

Patent Documents

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-190832 [Patent Document 2] Japanese Patent Application Laid-Open No. Hei 5-502216 [Patent Document 3] Japanese Patent Application Laid-Open No. 2013-216643 [Patent Document 4] Japanese Patent Application Laid-Open No. 2014-91739 [Summary of the Invention] [Problems to be Solved by the Invention]

[0008] By the way, when using pelargonic acid as a herbicidal active ingredient, the herbicidal effect is quickly manifested, so it is effective in enhancing the immediate effect of the herbicide.

[0009] Also, when using glyphosate salt as a herbicidal active ingredient, a sustained herbicidal effect is manifested, so it is effective in enhancing the persistence (also referred to as residual effect) of the herbicide.

[0010] Therefore, it is considered preferable to blend both pelargonic acid and glyphosate salt to obtain a herbicide having both immediate effect and persistence. However, for example, when a salt is blended into an emulsified composition, the emulsification becomes unstable, so it is extremely difficult to stably coexist the emulsified pelargonic acid and glyphosate salt.

[0011] On the other hand, in the field of herbicides, those of the type that users dilute with water at the time of use are known. This type of herbicide is sold in a state of a higher concentration than the actually used concentration, so the weight and volume at the time of sale can be small, and it is excellent in economy and portability.

[0012] Therefore, a diluted type of herbicide is also required for herbicides containing pelargonic acid and glyphosate salt. In that case, practically, it is required to be stable in the state at the time of sale, that is, in a high-concentration state, to be stable even after dilution with water and not to cause liquid separation, and to be easy to dilute.

[0013] However, in the first place, it is technically difficult for the peralgonic acid herbicide to be stably emulsified and solubilized even at normal concentrations. There is no known type that is diluted and has the above practicality and contains glyphosate salts.

[0014] The present invention has been made in view of such points, and an object thereof is to provide a herbicide composition that has both immediate effect and persistence and is stable in both the state at the time of sale and the state at the time of use when diluted with water and used.

Means for Solving the Problems

[0015] In order to achieve the above object, in a first aspect of the present disclosure, it is possible to assume a liquid herbicide composition diluted with water. The herbicide composition contains a herbicidal active ingredient containing peralgonic acid and glyphosate salts, any one or two or more cationic surfactants selected from monoalkyl-type cationic surfactants and dialkyl-type cationic surfactants, and water. The herbicide composition is transparent or translucent, and the herbicidal active ingredient is uniformly dispersed or dissolved in the herbicide composition. Further, when the concentration of the peralgonic acid is a, the concentration of the glyphosate salts is b, and the concentration of the cationic surfactant is c, the concentration ratio R2 = c / (a + b) is 0.35 or more and 1.40 or less.

[0016] According to this configuration, by combining peralgonic acid and glyphosate salts with a specific cationic surfactant to form a transparent or translucent uniform composition, it becomes a stable herbicide composition even in a high-concentration state before dilution with water and in a concentration state at the time of use after dilution with water. Further, for example, when sprayed on weeds or the like, the herbicidal effect by peralgonic acid, which is a herbicidal active ingredient, appears quickly, and furthermore, a sustained effect by glyphosate salts can be obtained.

[0017] In a second aspect of the present disclosure, a mixed vesicle formed by the permanganic acid and the cationic surfactant is formed in water after being diluted with the water.

[0018] According to this configuration, the dispersed state of permanganic acid can be stably maintained even after dilution with water, and the immediate herbicidal effect is excellent.

[0019] Here, in a herbicide containing permanganic acid as a herbicidal active ingredient, it is considered that a sufficient herbicidal effect cannot be obtained unless permanganic acid adheres to the surface of weeds when it is sprayed. On the other hand, the permanganic acid in the form of the above mixed vesicle interacts with the cationic surfactant and is contained in the self-aggregate. Whether the permanganic acid can adhere to the surface of weeds when it is sprayed on the weeds has not been studied so far. Through the study of the inventors of the present application, a high herbicidal effect was first confirmed by the permanganic acid herbicide composition in the form of a mixed vesicle.

[0020] That is, by containing any one or any two or more cationic surfactants selected from the group consisting of a monoalkyl-type cationic surfactant and a dialkyl-type cationic surfactant, permanganic acid is uniformly dispersed and dissolved as a self-aggregate of the mixed vesicle in water, and the permanganic acid that constituted the mixed vesicle adheres to the surface of weeds during spraying. Thereby, even when left under low-temperature or high-temperature conditions after dilution with water, it has excellent stability over time and a high herbicidal effect can be obtained.

[0021] In a third aspect of the present disclosure, the concentration of the herbicidal active ingredient is 40% by mass or less.

[0022] In a fourth aspect of the present disclosure, the concentration of the herbicidal active ingredient is 35% by mass or less.

[0023] That is, if the concentration of the herbicidal active ingredient is too high, it may separate in the state before dilution, so the above range is preferable.

[0024] In a fifth aspect of the present disclosure, the concentration of the pelargonic acid is 10% by mass or more. If the concentration of the pelargonic acid before dilution with water is within this range, sufficient immediate efficacy can be obtained after dilution with water.

[0025] In a sixth aspect of the present disclosure, the concentration of the glyphosate salts is 2.5% by mass or more. If the concentration of the glyphosate salts before dilution with water is within this range, sufficient persistence can be obtained after dilution with water.

[0026] In a seventh aspect of the present disclosure, when the concentration of the pelargonic acid is a and the concentration of the glyphosate salts is b, the concentration ratio R1 = b / a is 0.17 or more and 1.33 or less.

[0027] In an eighth aspect of the present disclosure, the concentration ratio R1 is 0.20 or more and 1.00 or less.

[0028] By setting the concentration ratio of the pelargonic acid to the glyphosate salts within this range, excellent stability is achieved, and an excellent balance between immediate efficacy and persistence is also obtained when diluted with water and used.

[0029] In a ninth aspect of the present disclosure, the concentration of the cationic surfactant is 7% by mass or more and 21% by mass or less.

[0030] In a tenth aspect of the present disclosure, the concentration of the cationic surfactant is 10% by mass or more and 20% by mass or less.

[0031] In an eleventh aspect of the present disclosure, when the concentration of the pelargonic acid is a, the concentration of the glyphosate salts is b, and the concentration of the cationic surfactant is c, the concentration ratio R2 = c / (a + b) is 0.40 or more and 1.30 or less.

[0032] In a twelfth aspect of the present disclosure, the concentration ratio R2 is 0.50 or more and 1.00 or less.

[0033] In a 13th aspect of the present disclosure, the concentration of the pelargonic acid after dilution with the water is 1.5% by mass or more and 6.0% by mass or less. Further, the concentration of the pelargonic acid after dilution with the water can also be 2.0% by mass or more and 4.0% by mass or less.

[0034] In a 14th aspect of the present disclosure, the concentration of the glyphosate salts after dilution with the water is 0.1% by mass or more and 4.0% by mass or less. Further, the concentration of the glyphosate salts after dilution with the water can also be 0.5% by mass or more and 2.0% by mass or less.

[0035] In a 15th aspect of the present disclosure, the viscosity before dilution with the water is 25 Pa·s or less. By setting the viscosity before dilution with the water to 25 Pa·s or less, it is easy for the user to dilute with water, and the practicality is excellent. The viscosity before dilution with the water can also be 20 Pa·s or less.

Advantages of the Invention

[0036] As described above, the herbicide composition is stable in both the state at the time of sale and the state at the time of use, and can be a composition having both immediate effect and persistence.

Modes for Carrying Out the Invention

[0037] Hereinafter, embodiments of the present invention will be described in detail. It should be noted that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0038] The herbicide composition according to an embodiment of the present invention is a liquid herbicide composition diluted with water. The herbicide composition diluted with water can also be called a diluted type herbicide composition. The herbicide composition contains a herbicidal active ingredient containing pelargonic acid and glyphosate salts, any one or two or more cationic surfactants selected from a monoalkyl type cationic surfactant and a dialkyl type cationic surfactant, and water. The herbicide composition is transparent or translucent, and the herbicidal active ingredient is uniformly dispersed in the herbicide composition. The herbicide composition may further contain a specific alcohol as described later.

[0039] "Transparent" means that the herbicide composition is transparent and clear without cloudiness. It may be colorless and transparent or colored and transparent. "Translucent" means that the degree of transparency is low and it is somewhat transparent.

[0040] The herbicide composition can be stored, for example, in various containers. By storing the herbicide composition in a container, a product used for weeding is constituted. This diluted type herbicide composition is used by the user after diluting it with water and spraying it on weeds. Therefore, at least until it reaches the user's hand, the herbicidal active ingredient will be present in water at a higher concentration compared to when in use. Here, if separation or the like occurs in the herbicide composition when it reaches the user's hand, it will be difficult for the user to appropriately perform operations such as metering and stirring when diluting with water. Therefore, it is important that the herbicide composition can be stored in a uniform state for a long period of time in a store or a warehouse.

[0041] In this regard, according to the configuration of the present invention as described below, the herbicide composition before dilution with water can be stably stored for a long period of time in a uniform state without any change in properties such as separation. When the user uses this herbicide composition, the required amount of the herbicide composition is measured, and water is added and diluted so that the concentrations of pelargonic acid and glyphosate salts reach a predetermined concentration, thereby adjusting the concentrations of the pelargonic acid and glyphosate salts. The amount of water to be added, that is, the dilution ratio, is preset and can be described on a container or the like, for example. The dilution ratio refers to how many times the amount of the undiluted solution is obtained. For example, if the dilution ratio is 2 times, water is added so that the amount becomes 2 times that of the undiluted solution. The dilution ratio does not have to be an integer multiple.

[0042] The dilution ratio of the herbicide composition with water can be 5 times or more, and the dilution ratio with water can also be 10 times or more, or 15 times or more. If the dilution ratio is less than 5 times, it is not preferable in terms of the fact that the merit of making it a dilution type becomes small. The upper limit of the dilution ratio of the herbicide composition with water can be 25 times or less, and the upper limit of the dilution ratio with water can also be 20 times or less, or 15 times or less. If the dilution ratio is too high, the concentration of the herbicidal active ingredient in the state before dilution has to be made extremely high, so the herbicide composition before dilution becomes unstable and the viscosity becomes too high, making the dilution operation difficult to perform.

[0043] When diluting the herbicide composition with water, for example, another dilution container is prepared, and a predetermined amount of the herbicide composition and water are put into the dilution container, whereby the diluted herbicide composition can be obtained. The herbicide composition may be put into the dilution container first, or water may be put in first. As described above, since the herbicide composition before dilution is in a uniform state, the user can appropriately perform operations such as measurement and stirring when diluting with water.

[0044] The diluted herbicide composition can be used by directly applying it from the dilution container to weeds, or it can be transferred to a spraying container separate from the dilution container and then applied to weeds. The container for accommodating the diluted herbicide composition may be provided with a shower nozzle having a number of openings. Further, the container for accommodating the diluted herbicide composition may be provided with a sprayer having a pump mechanism. Further, the container for accommodating the diluted herbicide composition may be an aerosol container provided with a valve and a nozzle. In this case, the herbicide composition according to the present invention is filled into the aerosol container together with a propellant to form an aerosol product.

[0045] Incidentally, if the herbicide composition after dilution with water separates immediately, it has to be stirred every time it is applied to weeds, resulting in a herbicide that is extremely inconvenient to use. In this regard, as will be described later, according to the configuration of the present invention, the herbicide composition after dilution with water can stably maintain a uniform state without separation or the like over a long period of time. Therefore, even a herbicide composition that has been diluted with water and has passed a certain amount of time can be directly applied to weeds as it is, realizing a herbicide with extremely high practicality.

[0046] (Herbicidal active ingredient) The herbicidal active ingredient according to the present embodiment contains pelargonic acid having immediate effect and glyphosate salts having persistence. The concentration of the herbicidal active ingredient containing pelargonic acid and glyphosate salts is set to 40% by mass or less before dilution with water. The concentration of the herbicidal active ingredient containing pelargonic acid and glyphosate salts can also be set to 35% by mass or less or 30% by mass or less before dilution with water. The lower limit of the concentration of the herbicidal active ingredient containing pelargonic acid and glyphosate salts can be set to 10% by mass or more before dilution with water. By setting such a concentration range, the herbicidal effect is sufficiently enhanced.

[0047] Pelargonic acid as a herbicidal active ingredient is used alone or as a major component (e.g., 90% or more) of a mixture containing other fatty acids. When other fatty acids are included, the herbicidal active ingredient can be one or a mixture of carboxyl fatty acids having a hydrocarbon chain with 8 to 12 carbon atoms containing pelargonic acid.

[0048] In water after diluting the herbicide composition with water, mixed vesicles are formed by pelargonic acid and a cationic surfactant. Pelargonic acid exists in the form of forming mixed vesicles by interacting with the cationic surfactant in water after diluting the herbicide composition with water. That is, the mixed vesicles are self-assemblies in which amphiphilic molecules having both hydrophobicity and hydrophilicity in water are arranged without gaps in a spherical shell shape or a bag shape, and since the layers of the self-assemblies are in multiple phases, pelargonic acid is uniformly contained, so that pelargonic acid can be stabilized in water for a long time.

[0049] The lower limit of the concentration of pelargonic acid in the liquid before diluting the herbicide composition with water is 10% by mass or more, and it can be set to 15% by mass or more. The upper limit of the concentration range of pelargonic acid in the herbicide composition before being diluted with water is 38% by mass or less, and 30% by mass or less is more preferable. When the concentration range of pelargonic acid in the herbicide composition before being diluted with water exceeds the above upper limit, the stability during storage deteriorates, and it becomes difficult to form mixed vesicles after diluting with water. Also, when the concentration range of pelargonic acid is below the above lower limit, the herbicidal effect becomes insufficient when the dilution ratio is, for example, 5 times or 10 times.

[0050] The lower limit of the concentration range of pelargonic acid in the liquid after diluting the herbicide composition with water is 1.5% by mass or more, and more preferably 2.0% by mass or more. The upper limit of the concentration range of pelargonic acid in the liquid after diluting the herbicide composition with water is 6.0% by mass or less, and more preferably 4.0% by mass or less. When the concentration range of pelargonic acid in the liquid after diluting the herbicide composition with water exceeds the above upper limit, it becomes difficult to form the above-mentioned mixed vesicles, and the formed mixed vesicles are likely to break. Also, when the concentration range of pelargonic acid is below the above lower limit, the herbicidal effect becomes insufficient and it also becomes difficult to form mixed vesicles.

[0051] Glyphosate salts as herbicidal active ingredients are residual herbicidal active ingredients with a long duration of efficacy. Examples of such glyphosate salts include glyphosate ammonium salt, glyphosate isopropylamine salt, glyphosate potassium salt, and the like.

[0052] Glyphosate salts are water-soluble and uniformly present in a dissolved state in water. The concentration of glyphosate salts before diluting the herbicide composition with water is set to 2.5% by mass or more. The concentration of glyphosate salts before diluting the herbicide composition with water may be set, for example, at 3.0% by mass or more, or 3.5% by mass or more.

[0053] The lower limit of the concentration range of glyphosate salts in the liquid after diluting the herbicide composition with water is 0.1% by mass or more, and more preferably 0.5% by mass. The upper limit of the concentration range of glyphosate salts in the liquid after diluting the herbicide composition with water is 4.0% by mass or less, and more preferably 2.0% by mass or less. When the concentration range of glyphosate salts exceeds the above upper limit, it becomes difficult to form mixed vesicles, or the formed mixed vesicles are likely to break. Also, when the concentration range of glyphosate salts is below the above lower limit, the herbicidal effect becomes insufficient.

[0054] When the concentration of pelargonic acid before diluting the herbicide composition with water is a, and the concentration of glyphosate salts before diluting the herbicide composition with water is b, the concentration ratio R1 = b / a is set to be 0.17 or more and 1.33 or less. Also, the concentration ratio R1 = b / a can be set to be 0.20 or more and 1.00 or less. By setting the value of R1 within the above range, the diluted herbicide composition becomes a herbicide with an excellent balance between immediate effect and persistence, and the stability of the herbicide composition is excellent both before and after dilution. Since R1 is the concentration ratio of pelargonic acid and glyphosate salts, it has the same value before and after diluting the herbicide composition with water.

[0055] Incidentally, since glyphosate salts are water-soluble, they exist dissolved in water. Here, when pelargonic acid and a surfactant form micelles in water (in the case of normal solubilization), the presence of salts in water may cause the solubilized state to become unstable and separate. In contrast, after dilution of the herbicide composition of this embodiment, although it is water in which glyphosate salts are dissolved, a uniform dispersion state can be stably maintained. This is considered to be because pelargonic acid and a cationic surfactant form mixed vesicles and are dispersed in water. As a result, after dilution of the herbicide composition, pelargonic acid and glyphosate salts can coexist stably in water.

[0056] (Cationic surfactant) In order to maintain the herbicide composition before dilution with water in a uniform state and to form the above-mentioned mixed vesicles in water of the herbicide composition after dilution with water, the above-mentioned specific cationic surfactant is required. The specific cationic surfactant is any one or any two or more cationic surfactants selected from the group of surfactants composed of a plurality of surfactants classified as monoalkyl-type cationic surfactants and a plurality of surfactants classified as dialkyl-type cationic surfactants. As the specific cationic surfactant, it may be only a monoalkyl-type cationic surfactant or only a dialkyl-type cationic surfactant. Further, as the specific cationic surfactant, it may contain a monoalkyl-type cationic surfactant and a dialkyl-type cationic surfactant. In this case, it may contain one monoalkyl-type cationic surfactant and two or more dialkyl-type cationic surfactants, or two or more monoalkyl-type cationic surfactants and one dialkyl-type cationic surfactant.

[0057] Examples of the monoalkyl-type cationic surfactant include lauryl trimethyl ammonium chloride, myristyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, alkyl (C12-C16) trimethyl ammonium chloride, alkyl (C16-C18) trimethyl ammonium chloride, dodecyl trimethyl ammonium chloride, and the like.

[0058] Examples of the dialkyl-type cationic surfactant include dioctyl dimethyl ammonium chloride, didecyl dimethyl ammonium chloride, dilauryl dimethyl ammonium chloride, dialkyl (C12-C18) dimethyl ammonium chloride, didecyl dimethyl ammonium chloride, dialkyl dimethyl ammonium chloride, dialkyl (C16-18) dimethyl ammonium chloride, and the like.

[0059] The lower limit of the concentration range of the specific cationic surfactant after dilution is 1.8% by mass or more, and more preferably 2.5% by mass or more. The upper limit of the concentration range of the cationic surfactant after dilution is 18.0% by mass or less, and more preferably 16.0% by mass or less. If the concentration range of the specific cationic surfactant before dilution is outside the above range, it becomes difficult to form mixed vesicles.

[0060] The concentration range of the specific cationic surfactant before dilution is set so that the concentration range of the specific cationic surfactant after dilution falls within the above range. For example, the upper limit of the concentration range of the specific cationic surfactant before dilution can be 21% by mass or less or 20% by mass or less. The lower limit of the concentration range of the specific cationic surfactant before dilution can be 7% by mass or more or 10% by mass or more. Thereby, the herbicide composition before dilution can be stably maintained in a uniform state, and mixed vesicles are formed in the water after dilution. The herbicide composition before dilution can also be referred to as a concentrated herbicide composition.

[0061] When the concentration of pelargonic acid before diluting the herbicide composition with water is a, the concentration of glyphosate salts before diluting the herbicide composition with water is b, and the concentration of the cationic surfactant before diluting the herbicide composition with water is c, the concentrations a to c are set so that the concentration ratio R2 = c / (a + b) is 0.35 or more and 1.40 or less. Also, the concentration ratio R2 = c / (a + b) can be set to be 0.40 or more and 1.30 or less, or can be set to be 0.50 or more and 1.00 or less. When the value of R2 is outside the above range, it becomes difficult to form mixed vesicles in the water after diluting the herbicide composition with water. Note that since R2 is the concentration ratio of pelargonic acid, glyphosate salts, and the cationic surfactant, it has the same value before and after diluting the herbicide composition with water.

[0062] As described above, by setting the concentrations of pelargonic acid, glyphosate salts, and the cationic surfactant within the above ranges, mixed vesicles can be formed in water after dilution with water. On the other hand, mixed vesicles may not be formed in the herbicide composition in the state before dilution with water. This is because before dilution with water, the concentrations of pelargonic acid and the cationic surfactant are high and may not be suitable for forming mixed vesicles. Even in this case, the herbicide composition before dilution with water can form a transparent or translucent uniform layer as a whole. This state is considered to be a state where pelargonic acid is in a solubilized state or a state close to it due to the high-concentration cationic surfactant, and it is a thermodynamically stable state. As a result, the herbicide composition before dilution with water can be stored stably in a uniform state without separation occurring over a long period of time.

[0063] (monohydric or polyhydric alcohol) In order to make the formation of the above mixed vesicles more certain in water after diluting the herbicide composition with water, it is preferable that the herbicide composition contains a specific alcohol. The specific alcohol is a monohydric or polyhydric alcohol, preferably an alcohol having 2 to 6 carbon atoms and 1 to 6 hydroxy groups. Examples of such alcohols include ethyl alcohol, propyl alcohol, isopropyl alcohol, 1,3-butylene glycol, propylene glycol, dipropylene glycol, glycerin, sorbitol, and the like.

[0064] The above specific alcohol is not essential, but by using these, the formation of mixed vesicles in water after dilution becomes more certain. When formulating an alcohol, the lower limit of the concentration range of the alcohol before dilution with water is 10% by mass or more, preferably 15% by mass or more, and more preferably 20% by mass or more. The upper limit of the concentration range of the alcohol before dilution with water is 35% by mass or less, and more preferably 30% by mass or less. If the concentration range of the alcohol is outside the above range, it becomes difficult to form mixed vesicles in water after dilution, or the formed mixed vesicles are easily broken, resulting in a decrease in stability.

[0065] (Other components) For the water contained in the herbicide composition before dilution, purified water or ion-exchanged water can be used. Further, the herbicide composition before dilution may contain, for example, a preservative. Examples of the preservative include, but are not limited to, isothiazolinone derivatives.

[0066] In addition, the herbicide composition before dilution may contain a pest control component (insecticide component). Examples of the pest control component include, but are not limited to, pyrethroid insecticides, neonicotinoid insecticides, diamide insecticides, etc. Examples of pyrethroid insecticides include transfluthrin, pyrethrin, allethrin, phthalthrin, tetramethrin, prallethrin, phenothrin, tralomethrin, cyfluthrin, resmethrin, permethrin, empenthrin, cyphenothrin, imiprothrin, fenpropathrin, fenvalerate, etofenprox, silafluofen, etc. Examples of neonicotinoid insecticides include imidacloprid, nitenpyram, acetamiprid, thiamethoxam, clothianidin, dinotefuran, etc. Examples of diamide insecticides include flubendiamide, chlorantraniliprole, cyantraniliprole, etc. One or more of these can be used in combination. The concentration of the pest control component after dilution can be 0.01% by mass or more and 0.10% by mass or less.

[0067] (Viscosity of the herbicide composition) The viscosity of the herbicide composition before dilution with water is set to 25 Pa·s or less. The viscosity of the herbicide composition before dilution with water can also be set to 20 Pa·s or 15 Pa·s or less. The lower limit of the viscosity of the herbicide composition before dilution with water can be set to 10.0 mPa·s or more. The viscosity of the herbicide composition can be adjusted by the concentration of pelargonic acid, the concentration of cationic surfactant, the concentration of the specific alcohol, etc. By setting the viscosity of the herbicide composition before dilution with water to 25 Pa·s or less, it is easy to mix with water when the user dilutes it with water, and the dilution operation becomes easier.

[0068] Note that the viscosity of the herbicide composition in the examples described below was measured with a single cylindrical rotational viscometer (Tokyo Keiki Co., Ltd. TVB-10). The method for measuring viscosity with a single cylindrical rotational viscometer is specified as a standard in JIS Z8803.

[0069] (Method for producing herbicide composition) An example of the method for producing a herbicide composition will be described. First, prepare purified water heated to 70°C. Dissolve the specific cationic surfactant, pelargonic acid, glyphosate salts, and alcohol in this purified water. If it contains a pest control component, the pest control component is also dissolved. Then, after cooling to room temperature, an antiseptic is added. The obtained herbicide composition contains a high concentration of pelargonic acid and is stored in a container as it is. The usage method is as described above.

Examples

[0070] Hereinafter, examples of the present invention will be described, but the present invention is not construed as being limited to the examples.

[0071]

Table 1

[0072] Table 1 shows the compositions of the herbicide compositions according to Examples 1 to 12 of the present invention. The concentration of pelargonic acid before dilution of the herbicide compositions of Examples 1 to 12 is 10% by mass or more and 30% by mass or less. The concentration of the cationic surfactant before dilution of the herbicide compositions of Examples 1 to 12 is 7.5% by mass or more and 21% by mass or less. The concentration of glyphosate ammonium salt before dilution of the herbicide compositions of Examples 1 to 12 is 2.5% by mass or more and 13.3% by mass or less. The herbicide compositions of Examples 1 and 3 to 11 are examples containing alcohol, and the concentration of alcohol before dilution is 5% by mass or more and 20% by mass or less. The concentration of the preservative before dilution of the herbicide compositions of Examples 1 to 12 is 0.02% by mass. The viscosity of the herbicide compositions of Examples 1 to 12 before dilution is 8.94 mPa·s or more and 22.87 Pa·s or less. The remainder (balance) is purified water. Note that the preservative hardly affects the herbicidal effect and viscosity.

[0073] In the herbicide compositions of Examples 1 to 12, the concentration ratio R1 (=b / a) of the glyphosate salt (concentration b) to pelargonic acid (concentration a), which is the herbicide active ingredient, is set in the range of 0.17 or more and 1.33 or less. Also, the concentration ratio R2 (=c / (a + b)) of the cationic surfactant (concentration c) to the herbicidal active ingredient (concentration a + b) is set in the range of 0.43 or more and 1.14 or more.

[0074] (Evaluation of Appearance) After preparing samples of the herbicide compositions of Examples 1 to 12, they were immediately placed in 100 ml glass bottles, and the appearance was visually evaluated at room temperature (RT). Note that the comparative examples described later were also evaluated in the same manner. In all of Examples 1 to 12, the appearance was transparent or translucent. The same applies even when a pest control component is mixed.

[0075] (Stability Evaluation) Next, the results of the stability test will be described. In the stability test, samples of the herbicide compositions of Examples 1 to 12 were placed in 100 ml glass bottles and stored in a constant temperature room at room temperature (RT), 5°C, and 50°C for 1 month each. The state (appearance) of the herbicide compositions after 1 month of storage was visually evaluated, and the stability was evaluated according to the following criteria. Note that the comparative examples described later were also evaluated in the same manner.

[0076] 〇: No separation (homogeneous single phase).

[0077] ×: Completely separated into two phases.

[0078] As shown in Table 1, the herbicide compositions of Examples 1 to 12 were all "〇" at all of "RT", "5°C" and "50°C", and a homogeneous single phase was maintained. That is, the herbicide compositions of the examples can be stably stored for a long period in the state before dilution with water. The same applies even when a pest control component is mixed.

[0079] (Evaluation after dilution) The cases where the herbicide compositions of Examples 1 to 12 were diluted 5-fold, 10-fold, 15-fold, 20-fold, and 25-fold respectively will be described. Whether a mixed vesicle is formed or not can be determined as follows. That is, after preparing samples of the herbicide compositions of Examples 1 to 12, they are put into a 100 ml glass bottle (sample bottle), and the glass bottle is put into a box having crossed polarizers (cross nicol) at room temperature (RT). By shining light on the sample bottle from outside the polarizer box and visually observing the state of the light passing through the sample bottle through the polarizer, it can be determined whether a mixed vesicle is formed or not. The comparative examples described later were also evaluated in the same manner. In addition, in order to confirm the stability of the herbicide composition after dilution, a test similar to the above stability test was carried out on the herbicide composition after dilution. As a result, in all cases where a mixed vesicle was formed, no separation or change in properties was observed even when stored in a very wide temperature range of 5°C to 50°C and for a very long period of one month. From the above, it can be seen that the herbicide compositions of the examples are extremely stable due to the formation of mixed vesicles after dilution. Note that the same result is obtained even when no preservative is contained. The same also applies when a pest control component is mixed.

[0080] Next, Comparative Examples 1 to 4 will be described.

[0081]

Table 2

[0082] In Comparative Example 1, although it was transparent in the appearance inspection, its stability at room temperature of 5°C was poor and precipitation occurred. Also, in this Comparative Example 1, no mixed vesicles were formed after dilution with water. Further, in Comparative Examples 2 to 4, they were separated in the appearance inspection, and no mixed vesicles were formed after dilution with water.

[0083] In addition, when the stability test was carried out in the same manner as above for the comparative examples after dilution in which no mixed vesicles were formed, changes in properties such as separation were observed, and it was confirmed that they were unstable.

[0084] (Weeding test) Next, the weeding test will be described. Table 3 shows the formulation of Comparative Example 5.

[0085]

Table 3

[0086] Comparative Example 5 is an example containing pelargonic acid and triethanolamine, and the content of pelargonic acid is 2.5% by mass.

[0087] The weeding test method is as follows. First, as test weeds, common purslane, Japanese millet, and large-flowered thistle were prepared. Each weed was transplanted into a pot, and the herbicides of Example 5 (5-fold diluted) and Comparative Example 5 were evenly sprayed on each weed using a hand spray with a discharge amount of 1 ml. The 5-fold dilution of Example 5 results in a content of pelargonic acid of 2.5% by mass.

[0088] Thereafter, the pots were placed in an artificial weather chamber (temperature 25°C, humidity 60%), and the state of the weeds was recorded using the interval shooting function of a camera. The results are shown in Table 4.

[0089]

Table 4

[0090] In Example 5, for all of purslane, Japanese millet, and Japanese hawksbeard, the time until it starts to wither is significantly shorter compared to Comparative Example 5. Also, the time until withering is significantly shorter for Example 5. Thus, with Example 5 in which a mixed vesicle is formed after dilution, an immediate herbicidal effect by pelargonic acid can be obtained. Note that although there are some differences in the length of time for the formulations of other examples other than Example 5, a similar herbicidal effect can be obtained.

[0091] Regarding the sustained herbicidal effect by glyphosate salts as well, in Example 5, an efficacy equivalent to that of Comparative Example 5 can be obtained. Note that a similar sustained effect can be obtained with the formulations of other examples other than Example 5.

[0092] (Effect of the Embodiment) As described above, according to the present embodiment, by combining pelargonic acid and glyphosate salts with a specific cationic surfactant to form a transparent or translucent uniform composition, a stable herbicide composition is obtained even in a high-concentration state before dilution with water and in a concentration state during use after dilution with water. Further, when sprayed on weeds or the like, for example, the herbicidal effect by pelargonic acid as the herbicidal active ingredient appears quickly, and furthermore, a sustained effect by glyphosate salts is obtained.

[0093] The above-described embodiment is merely illustrative in every respect and should not be construed in a limiting manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

Industrial Applicability

[0094] As described above, the herbicide composition according to the present invention can be used against weeds such as purslane, Japanese millet, and Japanese hawksbeard.

Claims

1. In a liquid herbicide composition diluted with water, it contains a herbicidally active ingredient comprising pelargonic acid and glyphosate salts, any one or more cationic surfactants selected from alkyltrimethylammonium chloride and dialkyldimethylammonium chloride, and water, when the concentration of the pelargonic acid is a, the concentration of the glyphosate salts is b, and the concentration of the cationic surfactant is c, the concentration ratio R2 = c / (a + b) is 0.35 or more and 1.40 or less, the concentration of the herbicidally active ingredient is 35% by mass or less, the concentration of the cationic surfactant is 7% by mass or more and 21% by mass or less, a herbicide composition that is transparent or translucent and in which the herbicidally active ingredient is uniformly dispersed or dissolved.

2. In the herbicide composition according to Claim 1, a herbicide composition in which a mixed vesicle formed by the pelargonic acid and the cationic surfactant is formed in water after dilution with the water.

3. In the herbicide composition according to Claim 1 or 2, a herbicide composition in which the concentration of the pelargonic acid is 10% by mass or more.

4. In the herbicide composition according to any one of Claims 1 to 3, a herbicide composition in which the concentration of the glyphosate salts is 2.5% by mass or more.

5. In the herbicide composition according to any one of Claims 1 to 4, a herbicide composition in which when the concentration of the pelargonic acid is a and the concentration of the glyphosate salts is b, the concentration ratio R1 = b / a is 0.17 or more and 1.33 or less.

6. In the herbicide composition according to Claim 5, a herbicide composition in which the concentration ratio R1 is 0.20 or more and 1.00 or less.

7. In the herbicide composition according to any one of claims 1 to 6, A herbicide composition in which the concentration of the cationic surfactant is 10% by mass or more and 20% by mass or less.

8. In the herbicide composition according to any one of claims 1 to 7, When the concentration of the pelargonic acid is a, the concentration of the glyphosate salts is b, and the concentration of the cationic surfactant is c, a herbicide composition in which the concentration ratio R2 = c / (a + b) is 0.40 or more and 1.30 or less.

9. In the herbicide composition according to any one of claims 1 to 8, A herbicide composition in which the concentration ratio R2 is 0.50 or more and 1.00 or less.

10. In the herbicide composition according to any one of claims 1 to 9, A herbicide composition in which the concentration of the pelargonic acid after dilution with water is 1.5% by mass or more and 6.0% by mass or less.

11. In the herbicide composition according to any one of claims 1 to 10, A herbicide composition in which the concentration of the glyphosate salts after dilution with water is 0.1% by mass or more and 4.0% by mass or less.

12. In the herbicide composition according to any one of claims 1 to 11, A herbicide composition in which the viscosity before dilution with water is 25 Pa·s or less.

Images