It is a dispersant for aqueous suspension concentrates. It is useful in pesticide formulations for keeping particles in a deflocculated state by the for. Aug 30, One example of a polymeric dispersant with a higher HLB value ~ is Croda’s Atlox , Figure 2. Atlox is a hydrophilic methyl. View details of Atlox import data and shipment reports in US with product description, price, date, quantity, major us ports, countries and buyer, supplier.
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In preferred embodiments of the invention, the first pesticide compound is pyraclostrobin and the further pesticide compound is selected from the group of amide fungicides as mentioned above, in particular from the group consisting of penflufen, seda- xane, penthiopyrad, fluxapyroxad and N- 4′-trifluoromethylthiobiphenylyl methyl- 3-difluoromethyl-1 H-pyrazolecarboxamid.
Despite the aforementioned advantages associated with the usage of SCs and FS’s, there is a number of problems known to the skilled person which are sometimes encountered with SCs and FS’s as a result of settling during prolonged storage or storage at elevated temperatures, the resistance of settled particles to re-suspension and the formation of crystalline material upon storage.
Microscopy of the emulsion direct after formation and after 24 h revealed that the pyraclostrobin contained in the emulsion was completely amorphous and remained amorphous for at least 24 h.
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Subsequently the suspension was passed through a suitable bead mill, using glass beads of 0. There are many different mechanisms in which stabilisation can be achieved by the surfactant system and one of the most common is by steric stabilisation. The terms polyethyleneglycol, polyethoxylates and polyethoxylated refer to polyether radicals derived from ethyleneoxide.
Addition is preferably performed at a temperature of at least 5 K, frequently at least 10 K, preferably at least 15 K, in particular at least 20 K, below the lowest melting point of the pesticide compound, e. The process according to claim 1 1where the anionic polymeric surfactant is polymer having a carbons backbone carrying carboxylate groups and polyether side chains. Mixing will be generally performed by using a suitable mixing device. In yet a further particular embodiment of the invention, the first pesticide compound is pyraclostrobin and the further pesticide compound is chlorothalonil.
An amorphous pesticide compound may be present e. Organic pesticide compounds having a low water solubility, i. Particular preference is also given to mono-Ci-Cio al- kylether of polyethylenoxid-polypropylenoxid-Blockpolmers having a number average molecular weight MN of from to Dalton. Moreover, the process of the present invention does not require tedious com- minution techniques as normally required in the preparation of aqueous suspension concentrates.
Agricultural compositions comprising an oil-in-water emulsion based on oily globules coated with a lamellar liquid crystal coating. The aqueous suspension to be added to the aqueous emulsion of the pesticide compound can be prepared by standard procedures for the preparation of aqueous suspensions of organic pesticide compounds.
Xanthan Gum and phyllosilicates, and especially mixtures thereof are preferred thickeners. Preferably, the polymeric surfac- tants c. Examples for polyhydric C2-C4 alcohols include ethylene glycol, 1 ,2-propane diol, 1 ,3-propane diol, glycerol and 1 ,4-butane diol. The formulation remained stable for more than 3 month at 0 C without demixing.
A process for the preparation of an aqueous suspension of an organic pesticide compound. The surfactants, which are contained in the aqueous suspension, may be identical with or different from the surfactants contained in the aqueous emulsion. P-XRD of the deformulated pyraclostrobin confirmed that the crystalline material was essentially modification IV of pyraclostrobin. In a particular preferred embodiment of the present invention, the emulsion comprises at least one non-ionic polymeric surfactant having at least one polyether group, in particular a non-ionic polymeric surfactant of the groups c.
This process is particularly suitable for the preparation of stable aqueous suspensions of organic pesticide compounds having a limited water solubility and a low melting point and which are capable of forming at least one stable crystalline form. This creates a larger steric barrier effectively preventing droplet coalescence and so the stability of the emulsion is increased. The process according to any of claims 17 to 19, which further comprises the addition of at least one further organic pesticide compound.
However, UL assumes no responsibility or liability for the accuracy of the information contained on this website and strongly encourages that upon final product or material selection information is validated with the manufacturer. This unique star shaped structure is what gives Atlox its superior stability. It is of course possible to use the aqueous suspension concentrates obtained by the process according to the invention as a tank-mix partner with other formulations.
Date of ref document: Moreover, the pesticide may melt during comminution because of the mechanical energy introduced by the comminution thereby causing clogging of the milling apparatus.
If the aqueous emulsion contains a combination of at least one anionic surfactant and at least one non-ionic surfactant, the weight ratio of anionic surfactant and non-ionic surfactant is preferably from 1: Likewise, the concentration of the further pesticide compound and the weight ratio of the first pesticide compound which contained in the aqueous suspension obtained in step b and the further pesticide compound will depend in a known manner from the type of first and second pesticide compound.
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To this emulsion, 1 10 grams of the aqueous suspension of step a was added at 40 0 C and the mixture was allowed to continue through 493 colloid mill for further 15 min. The three agencies responsible for the registration of agrochemicals in Brazil signed a technical cooperation agreement for the development of the Integrated Sy The aqueous suspension concentrates obtained by the process according to the invention can be obtained in any fields in which other formulations of the respective pesticide compounds are used.
Apart from that, the preparation of crystalline pyraclostrobin is currently tedious and time consuming and thus it increases the costs for preparing aqueous suspension concentrates of pyraclostrobin. Addition is preferably performed by mixing the aqueous emulsion with the aqueous suspension.
In a preferred embodiment of the invention, the pesticide compound contained in the aqueous emulsion is pyraclostrobin and the pesticide contained in the aqueous suspension which is added to the emulsion is a crystalline polymorph of pyraclostrobin, in particular a crystalline form which is essentially, i.
Therefore, the thus obtained suspension or a portion thereof can be used as the suspension to be added to the aqueous emulsion during a further run of the inventive process.
SCs and FS’s are generally prepared by suspending one or more organic pesticide compounds in water containing suitable surfactants and optionally further formulation additives and comminution of the suspended pesticide particles to the desired particle size. Preferably is comminution is performed at a temperature of at least 10 K below the lowest melting point of any pesticide compound present.
Solubility will usually be determined in deionized water at 20 0 C. EP-A discloses a process for preparing aqueous suspension concentrates of water-insoluble crystalline actives, where a stream of the molten active is combined under high shear conditions in a mixing chamber with an aqueous solvent stream, thereby emulsifying 44913 molten active, where the residence time qtlox the mixing chamber is chosen that the emulsion cools below the melting point of the active and the active particles solidify before leaving the mixing chamber.
The emulsion was cooled to 0 C while continuing to pass the mixture through the colloid mill. Then, in atlix second step a2the emulsion is cooled to a temperature, which is significantly below the lowest melting point of the crystalline form of the pesticide compound. The PEO moieties usually comprise at least 3, pref- erably atlos least 5, and more preferably at least 10 repeating units derived from ethylene oxide number average.
Request for preliminary examination filed after expiration of 19th month from priority date pct application filed from PAO usually ranges from 1: Aqueous formulations of poorly water-soluble active ingredient comprises a mixture of different hydrophobic poloxamer as solubilizer.
Milling was finished, when the specified particle size distribution had been achieved. The process according to any of the preceding claims, wherein step a comprises a. The surfactants of the groups c.