Formulations of clomazone

Patent metadata

Field	Value
Publication number	US-9801377-B2
Application number	US-201313920788-A
Country	US
Kind code	B2
Filing date	Jun 18, 2013
Priority date	Jul 27, 2012
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

New formulations of clomazone are provided, as well as new methods for making formulations of clomazone. The new formulations provide improved efficacy, decreased volatility, and/or increased loading of clomazone over the clomazone formulations in the prior art.

First claim

What is claimed is:

1. A formulation comprising multilayered particles comprising:
a core comprising clomazone,
a first encapsulating layer surrounding the core and comprising polyurea, and
a second encapsulating layer surrounding the first encapsulating layer and comprising polyvinyl alcohol,
wherein the weight ratio of the polyvinyl alcohol to clomazone is from 1:6 to 1:4, the weight ratio of polyurea to polyvinyl alcohol is from 1.5:1 to 1:1.5, and further wherein the multilayered particles contain at least 50% by weight of ciomazone.

2. An herbicidal composition comprising the formulation of claim 1 and a carrier.

3. The herbicidal composition of claim 2 , wherein the herbicidal composition exhibits clomazone volatility control of at least 80%.

4. The formulation of claim 1 comprising linseed oil in the core.

5. The formulation of claim 1 comprising clomazone in the core in an amount of from about 80 wt % to about 97 wt %%.

6. A method for preparing an herbicidal composition comprising the steps of:
a) preparing an aqueous suspension of particles comprising a core and a first encapsulating layer, wherein the core comprises clornazone and the first encapsulating layer comprises polyurea;
b) adding a polyvinyl alcohol to the aqueous suspension; and
c) spray drying the resulting mixture;
wherein the weight ratio of the polyvinyl alcohol to clomazone is from 1:6 to 1:4, the weight ratio of polyurea to polyvinyl alcohol is from 1.5:1 to 1:1.5, and further wherein the multilayered particles contain at least 50% by weight of clomazone.

7. A method for making water-dispersible granules for delivering agricultural chemicals to a crop comprising the steps of:
forming a water-dispersible powder containing at least one agriculturally active ingredient;
milling the water-dispersible powder; and
forming water-dispersible granules by combining the water-dispersible powder with a clomazone composition, wherein the clomazone composition comprises multilayered clomazone containing particles suspended in an aqueous solution, said multilayered clomazone containing particles comprising:
a core comprising clomazone,
a first encapsulating layer surrounding the core and comprising polyurea, and a second encapsulating layer surrounding the first encapsulating layer and comprising polyvinyl alcohol,
wherein the weight ratio of the polyvinyl alcohol to clomazone is from 1:6 to 1:4, the weight ratio of polyurea to polyvinyl alcohol is from 1.5:1 to 1:1.5, and further wherein the multilayered particles contain at least 50% by weight of clomazone;

wherein the granules exhibit controlled volatility.

8. The method of claim 7 , wherein the step of forming water-dispersible granules comprises:
kneading the clomazone composition into the milled water-dispersible powder to form a wetted powder,
forming granules by subjecting the wetted powder to pan pelletization, and drying the granules.

9. The method of claim 7 , wherein the step of forming water-dispersible granules comprises:
kneading the milled water-dispersible powder with water to form a dough,
extruding the dough to form granules,
spray coating the granules with the clomazone composition, and
drying the coated granules.

10. The method of claim 7 , wherein the step of forming water-dispersible granules comprises:
kneading the clomazone composition into the milled water-dispersible powder to form a
dough, and extruding the dough to form granules
and drying the granules.

11. The method of claim 7 , wherein the step of forming water-dispersible granules comprises:
mixing the milled water dispersible powder with an aqueous encapsulated clomazone composition, and
forming granules from the mixture by fluid bed agglomeration.

12. The method of claim 7 , wherein the step of forming water-dispersible granules comprises:
mixing the milled water-dispersible powder with the clomzone composition, and
spray-drying the mixture to form granules.

13. The method of claim 7 , wherein the step of forming water-dispersible granules comprises:
mixing the milled water-dispersible powder with the clomzone composition, and
spray-coating the mixture onto an inert carrier material.

14. The method of claim 7 , wherein the agriculturally active agent is an herbicide.

15. The method of claim 14 , wherein the herbicide is selected from the group consisting of aclonifen, diuron, hexoconazole, quinchlorac, sulfentrazone, hexazinone, 2,4-D, napropamide, and combinations thereof.

Assignees

• Fmc Corp

Inventors

• Liu Hong
• Welch Michael R
• Nicholson Paul
• Cook Jeffrey A
• Ranin Catherine
• Shinn Sandra L
• Pepper Robert F

Classifications

• A01N33/18

  Nitro compounds · CPC title

• A01N33/22

  having at least one oxygen or sulfur atom and at least one nitro group directly attached to the same aromatic ring system · CPC title

• A01N39/02

  Aryloxy-carboxylic acids; Derivatives thereof · CPC title

• A01N25/14

  wettable · CPC title

• A01N43/42

  condensed with carbocyclic rings · CPC title