| abstract |
The present invention relates to a process for the preparation of aqueous active compound compositions of active compounds with low solubility in water, in particular active compounds for the protection of cereals and material substances. The invention furthermore relates to the active compound compositions obtainable by this method and to their use for the control of pests in plants and in the protection of material substances. The method of the present invention comprises the following steps: a) an aqueous suspension of solid active compound particles comprising at least one active compound having a solubility in water of 5 g / l or less at 25 ° C./1013 mbar, in order to stabilize the active compound particles Preparing a suspension comprising at least one surfactant, wherein the active compound particles in the suspension have an average particle size of 1200 nm or less as determined by dynamic light scattering, b) emulsion polymerizing the first monomer composition M1 in an aqueous suspension of the active compound to form an aqueous dispersion of polymer / active compound particles, wherein the monomer composition M1 is at least based on its total weight 95% by weight, comprising at least one neutral monoethylenically unsaturated monomer M1.1 having a solubility in water of not more than 30 g / l at 25 ° C./1013 mbar, and c) emulsion polymerizing the second monomer composition M2 in the aqueous dispersion of polymer / active compound particles obtained in step b), wherein the monomer composition M2 is at least 60% by weight, based on its total weight, It contains at least one neutral monoethylenically unsaturated monomer M2.1 having a solubility in water of 30 g / l or less at 25 ° C./1013 mbar. |