Patent Application
20060199738
The present invention relates to a herbicidal composition.
Some compositions containing a herbicidal cyclohexanedione compound are known in U.S. Pat. No. 4,626,276, U.S. Pat. No. 4,741,768, U.S. Pat. No. 5,084,087 and U.S. Pat. No. 5,554,576.
The present invention provides a herbicidal composition comprising i) clethodim, ii) a sulfonate surfactant, iii) a block copolymer of ethylene oxide and propylene oxide and iv) an aromatic hydrocarbon.
According to the present invention, the composition containing clethodim can provide a stable emulsion when it is diluted with hard water as well as normal water.
In the present invention, clethodim is an herbicidal ingredient, and the chemical name of clethodim is (±)-2-[(E)-1-[(E)-3-chloroallyloxyimino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxyclclohex-2-enone of the formula:
It can be obtained in the market, for example, it is provided by Valent U.S.A. Corporation or Arvesta Corporation.
The content of clethodim in the herbicidal composition of the present invention is generally 5% to 40% by weight, preferably 10% to 30% by weight.
The sulfonate surfactant means an anionic surfactant having at least one sulfonic acid salt group in the molecule. Examples of the sulfonate surfactant include salts of alkylbenzene sulfonic acid (e.g., (C8-C15 alkyl)benzenesulfonate), salts of alkylnaphthalene sulfonic acid, salts of alkylsulfonic acid, salts of alkyl ether sulfonic acid, salts of fatty alcohol ether sulfonic acid and salts of polyoxyalkylene tristyrylphenyl ether sulfonic acid. Typical examples of the salt are calcium, sodium and potassium salts. Typical examples of the sulfonate are dodecylbenzenesulfonate, diisopropylnaphthalenesulfonate, diisobutylnaphthalenesulfonate, α-olefinsulfonate and dialkylsulfosuccinate. Among them, calcium dodecylbenzenesulfonate, sodium dodecylbenzenesulfonate and potassium dodecylbenzenesulfonate are preferably used.
The content of the sulfonate surfactant in the herbicidal composition of the present invention is generally 0.1% to 10% by weight, preferably 0.1% to 5% by weight.
The block copolymer of ethylene oxide (EO) and propylene oxide (PO) is also called polyoxylethylene polyoxypropylene block copolymer and it is well known as a nonionic surfactant. Examples of the block copolymer of ethylene oxide and propylene oxide are (PO)x-(EO)y, (EO)n-(PO)y, (PO)x-(EO)y-(PO)z and (EO)n-(PO)y-(EO)z. Among them, (PO)x-(EO)y-(PO)z, namely
and (EO)n-(PO)y-(EO)z, namely
are preferably used. The HLB of the block copolymer of ethylene oxide and propylene oxide is generally 11 to 20, preferably 13 to 19. HLB means Hydrophilic-Lipophilic Balance which is well known in the field of surfactant. The average molecular weight of the block copolymer of ethylene oxide and propylene oxide is generally in the range of from 1000 to 10000.
The content of the block copolymer of ethylene oxide and propylene oxide in the herbicidal composition of the present invention is generally 0.1% to 30% by weight, preferably 0.1% to 20% by weight.
The aromatic hydrocarbon is generally a solvent that can dissolve clethodim. Namely, the aromatic hydrocarbon is usually used in the amount that can dissolve the clethodim contained in the herbicidal composition.
Examples of the aromatic hydrocarbon include xylene, phenylxylylethane, Hisol SAS-296 (a mixture of 1-phenyl-1-xylylethane and 1-phenyl-1-ethylphenylethane, commercial name of Nippon Petroleum Company), Cactus Solvent HP-DMN (containing 80% of dimethylnaphthalene, commercial name of Nikko Petrochemical Company), Cactus Solvent P-100 (alkylbenzene having 9 to 10 of carbon number, commercial name of Nikko Petrochemical Company), Aromatic 150 (aromatic hydrocarbon, commercial name of ExxonMobil Chemical) and Aromatic 200 (aromatic hydrocarbon, commercial name of ExxonMobil Chemical).
The content of the aromatic hydrocarbon in the herbicidal composition of the present invention is generally 10% to 89.8% by weight.
Further, the herbicidal composition optionally comprises the other solvent, auxiliaries such as esters of fatty acid, antioxidant, fungicide, perfume, dyestuff, and so on.
The esters of fatty acid are generally can work as enhancer of bioefficacy. The formula of esters of fatty acid is RCOOR′; wherein R is an alkyl group having 7 to 21 carbon atoms or an alkenyl group having 7 to 21 carbon atoms, and R′ is an alkyl group having 1 to 8 carbon atoms. Examples of the group given by the formula RCO include palmitoyl, myristoyl, stearoyl, lauroyl and oleoyl. Examples of R′ are methyl, ethyl, isopropyl, butyl, isobutyl and octyl. Typical examples of the esters of fatty acid are methyl oleate, methyl palmitate, methyl laurate, isopropyl myristate, isopropyl palmitate, octyl laurate, octyl palmitate and butyl stearate.
When the ester of fatty acid is used, the content of the ester of fatty acid in the herbicidal composition is generally 0.1% to 79.8% by weight, preferably 10% to 50% by weight. In addition, when the ester of fatty acid is used, the content of the aromatic hydrocarbon in the herbicidal composition of the present invention is preferably 10% to 60% by weight.
Preferably, propyl gallate is used for antioxidant; the content of the propyl gallate in the herbicidal composition is generally 0.01% to 10% by weight, preferably 0.1% to 3% by weight.
The herbicidal composition of the present invention can be prepared by mixing i) clethodim, ii) a sulfonate surfactant, iii) a block copolymer of ethylene oxide and propylene oxide and iv) an aromatic hydrocarbon, and optionally the other solvent, auxiliaries and so on.
The herbicidal composition of the present invention is utilized as an emulsifiable concentrate in general, namely it is diluted with water to give an emulsion and applied to weeds, especially graminaceous weeds such as Agropyron tsukushiense, barnyardgrass (Echinochloa crus-galli), green foxtail (Setaria viridis), giant foxtail (Setaria faberi), large crabgrass (Digitaria sanguinalis), annual bluegrass (Poa annua), blackgrass (Alopecurus myosuroides), oats (Avena sativa), wild oats (Avena fatua), johnsongrass (Sorghum halepense), quackgrass (Agropyron repens), downy brome (Bromus tectorum) and bermudagrass (Cynodon dactylon) in broad-leaf crop (e.g. soybean, cotton, sugarbeet, peanut) fields. The application dosage is generally 10 g to 1000 g per hectare in the amount of clethodim, although it may vary with the kinds of objective weeds, weather conditions and so on. The dilution of the herbicidal composition can also be used for aerial application by helicopter, plane or radio-controlled helicopter. The herbicidal composition of the present invention may be diluted with water containing a spreading agent. Examples of the spreading agent include Agridex (commercial name of Helena Chemical Corporation), Dynamic (commercial name of Helena Chemical Corporation), Induce (commercial name of Helena Chemical Corporation) and Silwet L-77 (manufactured by Nihon Unicar).
Hereinafter, the present invention is explained in more detail referring to examples, but the present invention should not be limited in the following examples.
The following ingredients were thoroughly mixed to give a herbicidal composition of the present invention.
The following ingredients were thoroughly mixed to give a herbicidal composition of the present invention.
The following ingredients were thoroughly mixed to give a herbicidal composition of the present invention.
The following ingredients were thoroughly mixed to give a herbicidal composition of the present invention.
The following ingredients were thoroughly mixed to give a herbicidal composition of the present invention.
The following ingredients were thoroughly mixed to give a herbicidal composition of the present invention.
The following ingredients were thoroughly mixed to give a herbicidal composition of the present invention.
The following ingredients were thoroughly mixed to give a herbicidal composition of the present invention.
342 ppm hard water (obtained by dissolving 3.04 g of anhydrous calcium chloride and 0.139 g of magnesium chloride hexahydrate in distilled water and making up to 1 litter) was charged in a 95 ml-cylinder with lid, and keep at room temperature. Then 5 ml of each of the compositions obtained in Examples 1 to 8 was added. The cylinders were inverted 10 times in 20 seconds. After keeping the cylinders for two hours at room temperature, the separation of the top layer was observed as emulsion stability.
