Agrochemical formulation comprising encapsulated pesticide

Patent metadata

Field	Value
Publication number	US-9681659-B2
Application number	US-201213980936-A
Country	US
Kind code	B2
Filing date	Jan 23, 2012
Priority date	Jan 24, 2011
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

The present invention relates to a aqueous composition containing a suspended pesticide A, and microcapsules comprising a shell and a core, wherein the core contains a pesticide B and an aprotic, polar solvent B, and the shell contains poly(meth)acrylate, which comprises C 1 -C 24 alkyl esters of acrylic and/or methacrylic acid, acrylic acid, methacrylic acid, and/or maleic acid in polymerized form. The invention further relates to a method for preparing said composition comprising the mixing of the pesticide A, water and the microcapsules, to said microcapsule, wherein the core contains the pesticide B and a solvent A, wherein the weight ratio of the pesticide B to the sum of all solvents in the core is from 1:1 to 1:10, and wherein the microcapsule contains up to 7 wt % poly(meth)acrylate, based on the total amount of all pesticides in the core, all solvents in the core, and the poly(meth)acrylate.

First claim

We claim:

1. A stable aqueous composition comprising
a suspended pesticide A, and
microcapsules comprising a shell and a core, wherein
(a) the core contains a pesticide B, 2-heptanone, and a water-immiscible solvent A;
(b) the shell contains poly(meth)acrylate, which comprises monomers selected from the group consisting of C 1 -C 4 alkyl esters of acrylic acid, C 1 -C 4 alkyl esters of methacrylic acid, acrylic acid, methacrylic acid, maleic acid, pentaerythritol tri tetraacrylate, and mixtures thereof, in polymerized form;
wherein solvent A is a hydrocarbon, a vegetable oil, a fatty acid ester, methyl or ethyl-ester of a vegetable oil, or mixtures thereof;
wherein the weight ratio of solvent A to 2-heptanone is 3:1 to 1:2; wherein the water-solubility of pesticide B is less than 10 g/l at 20° C.; and wherein the solubility in water of solvent A is up to 50 g/L at 20° C.

2. The composition according to claim 1 , wherein the pesticide B is present in dissolved form.

3. The composition according to claim 1 , wherein the pesticide A has a solubility in water of less than 10 g/l at 20° C.

4. The composition according to claim 1 , wherein solvent A is a hydrocarbon.

5. The composition according to claim 1 , wherein the weight ratio of the sum of all pesticides in the core to the sum of all solvents in the core is from 1:1 to 1:10.

6. The composition according to claim 1 , wherein the microcapsule contains up to 7 wt % poly(meth)acrylate, based on the total amount of all pesticides in the core, all solvents in the core, and the poly(meth)acrylate.

7. A method for preparing the composition as defined in claim 1 , comprising mixing the pesticide A, water and the microcapsules.

8. A method for controlling phytopathogenic fungi and/or undesired plant growth and/or undesired attack by insects or mites and/or for regulating the growth of plants, where the aqueous composition as defined in claim 1 is applied to the particular pests, their habitat or the plants to be protected from the particular pest, the soil and/or on undesired plants and/or the useful plants and/or their habitat.

9. The method of claim 8 , wherein the pesticide B is present in dissolved form.

10. The method of claim 8 , wherein the pesticide A has a solubility in water of less than 10 g/l at 20° C.

11. The method of claim 8 , wherein solvent A is a hydrocarbon.

12. A microcapsule comprising a shell and a core, wherein
(a) the core contains a pesticide B, 2-heptanone, and a water-immiscible solvent A;
(b) the shell contains poly(meth)acrylate, which comprises monomers selected from the group consisting of C 1 -C 4 alkyl esters of acrylic acid, C 1 -C 4 alkyl esters of methacrylic acid, acrylic acid, methacrylic acid, maleic acid, pentaerythritol tri- and tetraacrylate, and mixtures thereof, in polymerized form;
wherein solvent A is a hydrocarbon, a vegetable oil, a fatty acid ester, methyl or ethyl-ester of a vegetable oil, or mixtures thereof;
wherein the weight ratio of solvent A to 2-heptanone is 3:1 to 1:2; wherein the water-solubility of pesticide B is less than 10 g/l at 20° C.; wherein the solubility in water of solvent A is up to 50 g/l at 20° C.; wherein the weight ratio of the pesticide B to the sum of all solvents in the core is from 1:1 to 1:10, and wherein the microcapsule contains up to 7 wt % poly(meth)acrylate, based on the total amount of all pesticides in the core, all solvents in the core, and the poly(meth)acrylate.

13. A method for preparing the microcapsules as defined in claim 12 , comprising heating an oil-in-water emulsion, which contains a radical initiator, the solvent A, 2-heptanone, the pesticide B, and a monomer selected from C 1 -C 4 alkyl esters of acrylic acid, C 1 -C 4 alkyl esters of methacrylic acid, acrylic acid, methacrylic acid, maleic acid, PETIA, and mixtures thereof, and obtaining the microcapsules.

Assignees

• Taranta Claude
• Bork Thomas
• Schroeder-Grimonpont Tina
• Katz Britta
• Sikuljak Tatjana
• Nord Simon
• Distler Juergen
• Warriner Richard A
• Bihlmeyer Daniel
• Wofford James Thomas
• Basf Se

Inventors

• Taranta Claude
• Bork Thomas
• Schroeder-Grimonpont Tina
• Katz Britta
• Sikuljak Tatjana
• Nord Simon
• Distler Juergen
• Warriner Richard A
• Bihlmeyer Daniel
• Wofford James Thomas

Classifications

• A01N25/28

  Microcapsules {or nanocapsules} · CPC title

• A01N53/00

  Biocides, pest repellants or attractants, or plant growth regulators containing cyclopropane carboxylic acids or derivatives thereof · CPC title

• A01N25/04 Primary

  Dispersions, {emulsions, suspoemulsions, suspension concentrates} or gels (foams A01N25/16) · CPC title

• A01N25/22

  containing ingredients stabilising the active ingredients · CPC title

• A01N25/10

  Macromolecular compounds · CPC title