Microencapsulated nitrification inhibitor composition

Patent metadata

Field	Value
Publication number	US-9862652-B2
Application number	US-201514702126-A
Country	US
Kind code	B2
Filing date	May 1, 2015
Priority date	May 2, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

The present invention relates to an improved nitrification inhibitor composition and its use in agricultural applications.

First claim

The invention claimed is:

1. A microcapsule suspension formulation, comprising:
(a) a suspended phase, the suspended phase including a plurality of microcapsules, the microcapsules having a volume median particle size of from about 1 to about 10 microns, wherein the microcapsules comprise:
(1) a microcapsule wall produced by an interfacial polycondensation reaction between a polymeric isocyanate and a polyamine to form a polyurea shell having a weight percentage of about 0.2 to about 40 percent of a total weight of the microcapsule suspension formulation, and
(2) a substantially liquid core, the substantially liquid core is encapsulated within the polyurea shell, wherein the substantially liquid core includes about 60 weight percent 2-chloro-6-(trichloromethyl)pyridine of the entire microcapsule and wherein at a temperature of at least 15° C. the substantially liquid core includes no more than 1.0 weight percent solid 2-chloro-6-(trichloromethyl)pyridine; and

(b) an aqueous phase, wherein the aqueous phase includes at least about 1.0 weight percent aromatic solvent of a total weight of the microcapsule suspension formulation.

2. The microcapsule suspension formulation according to claim 1 , further including:
at least one ionic stabilizer present in the aqueous phase.

3. The microcapsule suspension formulation according to claim 1 , wherein the aromatic solvent present in the aqueous phase is at least one compound selected from the group consisting of: light aromatics, naphthalene depleted light aromatics, heavy aromatics, and naphthalene depleted heavy aromatics.

4. The microcapsule suspension formulation according to claim 3 , wherein the aromatic solvent present in the aqueous phase is naphthalene depleted heavy C10-13aromatics.

5. The microcapsule suspension formulation according to claim 4 , wherein the aromatic solvent present in the aqueous phase comprises between about 1% by weight and about 10% by weight naphthalene depleted heavy C10-13 aromatics.

6. The microcapsule suspension formulation according to claim 4 , wherein the aromatic solvent present in the aqueous phase, comprises between about 2% by weight and about 5% by weight naphthalene depleted heavy C10-13 aromatics.

7. The microcapsule suspension formulation according to claim 4 , wherein the aromatic solvent present in the aqueous phase comprises between about 2.5% by weight and about 3.0% by weight naphthalene depleted heavy C10-13 aromatics.

8. The microcapsule suspension formulation according to claim 3 , wherein the aromatic solvent present in the aqueous phase is heavy C10-13 aromatics.

9. The microcapsule suspension formulation according to claim 8 , wherein the aromatic solvent present in the aqueous phase comprises between about 1% by weight and about 10% by weight heavy C10-13 aromatics.

10. The microcapsule suspension formulation according to claim 8 , wherein the aromatic solvent present in the aqueous phase comprises between about 2% by weight and about 5% by weight heavy C10-13 aromatics.

11. The microcapsule suspension formulation according to claim 8 , wherein the aromatic solvent present in the aqueous phase comprises between about 2.5% by weight and about 3.0% by weight heavy C10-13 aromatics.

12. The microcapsule suspension formulation according to claim 1 , wherein the microcapsules have a volume median particle size of from about 1 to about 5 microns.

13. The microcapsule suspension formulation according to claim 1 , wherein the ratio of the suspended phase a) to the aqueous phase b) is from about 1:0.75 to about 1:100.

14. The microcapsule suspension formulation according to claim 1 , wherein the ratio of the suspended phase a) to the aqueous phase b) is from about 1:1 to about 1:7.

15. The microcapsule suspension formulation according to claim 1 , wherein the ratio of the suspended phase a) to the aqueous phase b) is from about 1:1 to about 1:4.

16. The microcapsule suspension formulation according to claim 1 , wherein the polymeric isocyanate is polymethylene polyphenylisocyanate.

17. A fertilizer composition comprising: a nitrogen fertilizer and the microcapsule suspension formulation according to claim 1 .

18. The fertilizer composition according to claim 17 , wherein the nitrogen fertilizer is urea ammonium nitrate.

19. A method of suppressing the nitrification of ammonium nitrogen in growth medium comprising the steps of applying the microcapsule suspension formulation of claim 1 to a plant growth medium.

20. The method according to claim 19 , wherein the formulation is applied in combination with a pesticide or sequentially with a pesticide.

Assignees

• Dow Agrosciences Llc

Inventors

• Dave Hiteshkumar
• Liu Lei
• Boucher Jr Raymond E
• Powels Greg
• Williams Alex
• Burkhart Miriam

Classifications

• C05G3/90

  for affecting the nitrification of ammonium compounds or urea in the soil · CPC title

• C05G5/35 Primary

  Capsules, e.g. core-shell · CPC title

• C05G3/60 Primary

  Biocides or preservatives, e.g. disinfectants, pesticides or herbicides; Pest repellants or attractants · CPC title

• A61K9/1075

  Microemulsions or submicron emulsions; Preconcentrates or solids thereof; Micelles, e.g. made of phospholipids or block copolymers (A61K9/0026 takes precedence) · CPC title

• C05C11/00

  Other nitrogenous fertilisers · CPC title