Production of Solid Solutions of Pesticides by Short-Term Superheating and Rapid Drying

• US 20100062940A1
• Filed: 11/23/2007
• Published: 03/11/2010
• Est. Priority Date: 12/01/2006
• Status: Active Grant

• Current Assignee: BASF SE
• Original Assignee: BASF SE
• Inventors: Koltzenburg, Sebastian, Türk, Holger, Kolter, Karl, Ascherl, Hermann, Knieriem, Torsten, Dieleman, Cedric, Schönherr, Michael
• Granted Patent: US 9,480,250 B2
• Time in Patent Office: Days
• US Class Current: 504/116.100
• CPC Class Codes: A01N 2300/00 Combinations or mixtures of active ingredients covered by classes A01N27/00 - A01N65/48 with other active or formulation relevant ingredients, e.g. specific carrier materials or surfactants, covered by classes A01N25/00 - A01N65/48
• CPC Class Codes: A01N 25/10 Macromolecular compounds
• CPC Class Codes: A01N 25/12 Powders or granules A01N25/26 takes precedence
• CPC Class Codes: A01N 43/653 1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
• CPC Class Codes: A01N 47/24 containing the groups , or; Thio analogues thereof

Abstract

The present invention relates to a method for the production of solid solutions of sparingly soluble pesticides, pulverulent products that are obtained by said method and their use for pesticide formulations.

Claims

1-18. -18. (canceled)

19. A method for the production of pulverulent or granulated solid solution of a sparingly soluble pesticide, in which the sparingly soluble pesticide is molecularly dispersed in a matrix of inactive ingredients, comprising

preparing a solution of the pesticide and of the inactive ingredients of the matrix by heating an aqueous suspension of the sparingly soluble pesticide in the presence of the inactive ingredients of the matrix to temperatures that are above the boiling point at normal pressure and the sparingly soluble pesticide is dissolved, and

converting the solution of the sparingly soluble pesticide and of the inactive ingredients of the matrix to a solid form by spraying and drying, the temperature of the solution before being fed into a spraying device being between 80°

C. and 350°

C.

20. The method of claim 19, wherein the temperature of the solution before spraying is between 80 and 300°

C. and the pesticide is present in dissolved form.

21. The method of claim 19, wherein the residence time of the solution at temperatures above 90°

C. is less than 180 seconds.

22. The method of claim 19, wherein the concentration of the sparingly soluble pesticide in the matrix of inactive ingredients is between 1 and 50 wt. %.

23. The method of claim 19, wherein the solution contains an adsorbent.

24. The method of claim 19, wherein the suspension of the pesticide is heated by mixing with a hot stream of liquid or a hot stream of steam.

25. The method of claim 24, wherein the ratio of the suspension of the pesticide to the hot liquid stream is between 9:

1 and 1;

9.

26. The method of claim 19, wherein methods of spray drying or fluidized-bed spray granulation are used for drying.

27. The method of claim 26, wherein an adsorbent or dusting agent is injected into a spraying tower during spray drying.

28. A solid solution of sparingly soluble pesticides in the form of powders or granules obtained by heating an aqueous suspension of the sparingly soluble pesticide in the presence of inactive ingredients of the matrix to temperatures that are above the boiling point at normal pressure, and dissolution of the sparingly soluble pesticide, and subsequently converting the solution of the sparingly soluble pesticide and the inactive ingredients of the matrix to a solid form by spraying and drying, the temperature of the spray solution before it is fed into the spraying device being 80°

C. to 350°

C.

29. The solid solution according to claim 28, wherein it contains a) 1-50 wt. % pesticide, b) 10-99 wt. % of a water-soluble inactive ingredient of the matrix, c) 0-30 wt. % of solubilizers and d) 0-50 wt. % of other usual inactive ingredients.

30. A formulation comprising a solid solution according to claim 28.

31. The formulation of claim 30, comprising a) 1-50 wt. % pesticide, b) 10-99 wt. % of a water-soluble inactive ingredient of the matrix, c) 0-30 wt. % of solubilizers and d) 0-50 wt % of other usual inactive ingredients.

32. A method of controlling growth of weeds, wherein the weeds, the soils on which the weeds grow, or their seeds are treated with a formulation according to claim 31.

33. A method of controlling attack by insect or mite pests on plants and/or for controlling phytopathogenic fungi, wherein the fungi/insects, their habitat or the plants or soils to be protected against fungal or insect attack or the plants, the soils on which the plants grow, or their seeds are treated with a formulation according to claim 31.

34. Seeds treated with a formulation according to claim 31.