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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The nature of the further pesticide compound will naturally depend on the pesticide compound contained in the aqueous suspension obtained in step b. A skilled person is familiar with these methods which are described e. The emulsion was cooled to 0 C while continuing to pass the mixture through the colloid mill. In a particular preferred embodiment of the invention, the emulsion comprises at least one non-ionic polymeric surfactant, in particular a non-ionic polymeric surfactant of the groups c.
In a very preferred embodiment of the present invention, the surfactant additionally comprises at least one non-ionic surfactant. The melting points and heats of fusion indicated here refer to values determined by differential calorimetry Differential Scanning Calorimetry: Preferably the further surfac- tant is selected from the groups c. Preparation of an aqueous suspension concentrate containing pyraclostrobin and epoxiconazol. The comminution is performed at a temperature, where the organic pesticide compound remains in the form of molten droplets.
Ref legal event code: However, surface properties of the particles are critical to the effectiveness of the polymer. In yet a further particular embodiment of the invention, the first pes- ticide compound is pyraclostrobin and the further pesticide compound is fluxapyroxad. The process according to any of the preceding claims, where the aqueous emulsion additionally contains at least one anionic or non-ionic polymeric surfactant having at least one polyether group. Xanthan Gum and phyllosilicates, and especially mixtures thereof are preferred thickeners.
Milling was finished, when the specified particle size distribution had been achieved. The process, however, is limited to pesticide compounds which rapidly crystallize upon cooling.
Bactericides can be added to stabilize the suspension concentrates against attack by microorganisms. The three agencies responsible for the registration of agrochemicals in Brazil signed a technical cooperation agreement for the development of the Integrated Sy Formulation according to reference example 4. In a preferred embodiment of the present invention, the emulsion comprises at least one non-ionic polymeric surfactant having at least one polyether group, in particular at least one poly-C2-C4-alkylenether group, in particular a non-ionic polymeric surfactant of the groups c.
Therefore it is an object of the present invention to provide a process for preparing sta- ble aqueous formulations in the form of aqueous suspension concentrates, which formulations comprise at least one organic pesticide compounds having no or only limited water solubility and having a low melting point.
Star polymers are another class of polymeric surfactants gaining interest because of their characteristic rheological and dilute solution properties. If pyraclostrobin is the first pesticide compound, suitable pesticide compounds which may be co-formulated with pyraclostrobin include e. The process of the present invention is particularly suitable for preparing stable aque- ous suspensions of pyraclostrobin. 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 the molten active, where the residence time in 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.
This created a film of solid amorphous pyraclostrobin. Preferably, the water contains one or more of the aforementioned surfactants in the aforementioned concentrations.
The following ingredients were added to a suitable vessel with stirring in the following order:. The comminution is performed at a temperature, where the arlox and any further organic pesticide compound remain in the form 493 solid particles.
There is also a hydrophilic aspect to the molecule that arises from the unreacted arms of the ethoxylated sorbitol base structure. Then, in a 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 surfactants of the groups c.
Datasheets & MSDS
The further pesticide compound may be water soluble or may have limited water solubility as defined herein, the latter being preferred. However, in the process of the present invention, crystallization rate will generally be very rapid and generally completed within seconds or minutes.
The further pesticide compound may also be added as a liquid, e. As particles approach each other, the adsorbed dispersant chains intermingle, which is thermodynamically unfavourable and presents a barrier wtlox further attraction. Atlo size of the aqueous emulsions and suspensions were determined on appropriate dilutions by laser light scattering using a Malvern Mastersizer 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.
Subsequently the suspension was passed through a suitable bead mill, using glass beads of 0.
You may choose a language below atox continue to this industry or close this dialog above. Aqueous formulations of poorly water-soluble active ingredient comprises a mixture of different hydrophobic poloxamer as solubilizer.
A microscopic sample of the suspension indicated complete crystallization. Wetting agents are surfactants which primarily lower the inter- facial tension between the liquid phase and the surface of the solid particles of the active ingredient here, the pesticide compound that are dispersed or emulsified in the aqueous phase, thereby assisting in stabilizing the particles in the aqueous phase.
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Hydrophilic PEG chains extend into the water phase and the hydrophobic polymer backbone sits on the interface of the dispersed particle covering the surface and the extended polymer chains prevent the particles from coming into contact with other particles.
Organic pesticide compounds having a low water solubility, i. The aqueous suspension obtained in step b will generally contain the one or more surfactants contained in the aqueous emulsion and in the aqueous suspension of the pesticide compound that has been added to the aqueous emulsion. The aqueous suspension, which is added to the aqueous emulsion of the pesticide compound, may contain one or more surfactants and may further contain further formulation additives.