Low volatility herbicidal compositions

• US 9,743,664 B2
• Filed: 11/05/2013
• Issued: 08/29/2017
• Est. Priority Date: 11/05/2012
• Status: Active Grant

• Current Assignee: Monsanto Technology LLC (Bayer AG)
• Original Assignee: Monsanto Technology LLC (Bayer AG)
• Inventors: Hemminghaus, John W., MacInnes, Alison, Wright, Daniel R., Zhang, Junhua
• Primary Examiner(s): Pryor, Alton
• Application Number:
  US14/440,789
• Publication Number:
  US 20150264924A1
• Time in Patent Office: 1,393 Days
• Field of Search: None
• 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 25/22 containing ingredients stabilising the active ingredients
• CPC Class Codes: A01N 37/02 Saturated carboxylic acids or thio analogues thereof; Derivatives thereof
• CPC Class Codes: A01N 37/04 polybasic
• CPC Class Codes: A01N 37/40 having at least one carboxylic group or a thio analogue, or a derivative thereof, and one oxygen or sulfur atom attached to the same aromatic ring system
• CPC Class Codes: A01N 39/04 Aryloxy-acetic acids; Derivatives thereof
• CPC Class Codes: A01N 57/02 having alternatively specified atoms bound to the phosphorus atom and not covered by a single one of groups A01N57/10, A01N57/18, A01N57/26, A01N57/34
• CPC Class Codes: A01N 57/20 containing acyclic or cycloaliphatic radicals
• CPC Class Codes: G09B 19/00 Teaching not covered by other main groups of this subclass teaching or practice apparatus for gun-aiming or gun-laying F41G3/26

Abstract

The present invention relates generally low volatility herbicidal compositions comprising at least one auxin herbicide and at least one monocarboxylic acid, or monocarboxylate thereof. The invention further relates generally to methods for preparing and using such low volatility herbicidal compositions, including methods for controlling auxin-susceptible plant growth on agricultural and non-agricultural lands.

Claims

1. A herbicidal composition concentrate comprising:

(a) at least one auxin herbicide, or an agriculturally acceptable salt or ester thereof;

(b) at least one monocarboxylic acid, or a monocarboxylate thereof;

(c) a neutralizing base, wherein the neutralizing base is an alkali metal hydroxide selected from potassium hydroxide, sodium hydroxide, or a mixture thereof; and

(d) a non-auxin herbicide selected from the group consisting of glyphosate or an agriculturally acceptable salt or ester thereof, glufosinate, or an agriculturally acceptable salt or ester thereof, or a mixture thereof;

wherein;

the acid equivalent weight ratio of auxin herbicide to non-auxin herbicide is from about 1;

5 to about 2;

1; and

the acid equivalent weight ratio of monocarboxylic acid, or monocarboxylate thereof, to auxin herbicide is from about 1;

10 to about 5;

1.

2. The herbicidal composition concentrate of claim 1, wherein the molar ratio of monocarboxylic acid, or monocarboxylate thereof, to auxin herbicide is from about 1:

10 to about 10;

1.

3. The herbicidal composition concentrate of claim 1, wherein the concentrate comprises an amount (acid equivalent weight) of the monocarboxylic acid, or monocarboxylate thereof, from about 0.25% to about 25% by weight of the concentrate.

4. The herbicidal composition concentrate of claim 1, wherein:

the molar ratio of monocarboxylic acid, or monocarboxylate thereof, to auxin herbicide is from about 1;

10 to about 10;

1;

and

the concentrate comprises an amount (acid equivalent weight) of the monocarboxylic acid, or monocarboxylate thereof, from about 0.25% to about 25% by weight of the concentrate.

5. The herbicidal composition concentrate of claim 1, wherein the concentrate comprises dicamba, or an agriculturally acceptable salt or ester thereof.

6. The herbicidal composition concentrate of claim 1, wherein the concentrate comprises 2,4-D, or an agriculturally acceptable salt or ester thereof.

7. The herbicidal composition concentrate of claim 1, wherein the concentrate comprises acetic acid, or an agriculturally acceptable salt thereof.

8. The herbicidal composition concentrate of claim 1, wherein the concentrate comprises dicamba, or an agriculturally acceptable salt or ester thereof, and acetic acid, or an agriculturally acceptable salt thereof.

9. The herbicidal composition concentrate of claim 1, wherein the concentrate comprises 2,4-D, or an agriculturally acceptable salt or ester thereof, and acetic acid, or an agriculturally acceptable salt thereof.

10. The herbicidal composition concentrate of claim 1, wherein the non-auxin herbicide is glyphosate, or an agriculturally acceptable salt thereof.

11. The herbicidal composition concentrate of claim 1, wherein the non-auxin herbicide is glufosinate, or an agriculturally acceptable salt thereof.

12. The herbicidal composition concentrate of claim 1, wherein

the sum of the concentration of auxin herbicide and the concentration of non-auxin herbicide is from about 120 grams (acid equivalent weight)/L to about 600 grams (acid equivalent weight)/L.

13. The herbicidal composition concentrate of claim 1, wherein the concentrate is a dry herbicidal composition.

14. The herbicidal composition concentrate of claim 1, wherein the concentrate is a liquid herbicidal composition.

15. The herbicidal composition concentrate of claim 1, wherein the neutralizing base is potassium hydroxide.

16. The herbicidal composition concentrate of claim 1, wherein the neutralizing base is sodium hydroxide.

17. The herbicidal composition concentrate of claim 1, comprising the neutralizing base and monocarboxylic acid at a molar ratio of about 50:

50 (1;

1) or about 60;

40 (1.5;

1).

18. The herbicidal composition concentrate of claim 8, wherein the neutralizing base is potassium hydroxide.

19. The herbicidal composition concentrate of claim 8, wherein the neutralizing base is sodium hydroxide.

20. The herbicidal composition concentrate of claim 8, comprising the neutralizing base and monocarboxylic acid at a molar ratio of about 50:

50 (1;

1) or about 60;

40 (1.5;

1).

21. A herbicidal composition comprising:

(a) at least one auxin herbicide comprising dicamba or an agriculturally acceptable salt or ester thereof;

(b) at least one monocarboxylic acid, and at least one monocarboxylate thereof; and

(c) water;

wherein the composition further comprises a non-auxin herbicide selected from the group consisting of glyphosate or an agriculturally acceptable salt or ester thereof, glufosinate, or an agriculturally acceptable salt or ester thereof, or a mixture thereof; and

wherein;

the acid equivalent weight ratio of auxin herbicide to non-auxin herbicide is from about 1;

5 to about 2;

1; and

the acid equivalent weight ratio of monocarboxylic acid, or monocarboxylate thereof, to auxin herbicide is from about 1;

10 to about 5;

1;

wherein the herbicidal composition is prepared by a process comprising;

mixing the dicamba, or agriculturally acceptable salt or ester thereof, the monocarboxylic acid, and a neutralizing base comprising an alkali metal hydroxide selected from potassium hydroxide, sodium hydroxide, or a mixture thereof, thereby forming a liquid concentrate comprising the dicamba, or agriculturally salt or ester thereof, and the monocarboxylate;

or

mixing the dicamba, or agriculturally acceptable salt or ester thereof, with the monocarboxylate, thereby forming a liquid concentrate comprising the dicamba, or agriculturally acceptable salt or ester thereof, and the monocarboxylate.

22. The herbicidal composition of claim 21, wherein the composition comprises acetic acid, or an agriculturally acceptable salt thereof.

23. The herbicidal composition of claim 21, wherein:

the sum of the concentration of auxin herbicide and the concentration of non-auxin herbicide is from about 1 gram (acid equivalent weight)/L to about 50 grams (acid equivalent weight)/L.

24. The herbicidal composition of claim 23, wherein the composition comprises acetic acid, or an agriculturally acceptable salt thereof;

and glyphosate, or an agriculturally acceptable salt thereof.

25. The herbicidal composition of claim 23, wherein the composition comprises acetic acid, or an agriculturally acceptable salt thereof;

and glufosinate, or an agriculturally acceptable salt thereof.

26. The herbicidal composition of claim 21, wherein the neutralizing base and monocarboxylic acid are combined at a molar ratio of about 50:

50 (1;

1) or about 60;

40 (1.5;

1).

27. The herbicidal composition of claim 21, wherein the neutralizing base comprises potassium hydroxide.

28. The herbicidal composition of claim 21, wherein the neutralizing base comprises sodium hydroxide.

29. The herbicidal composition of claim 21, wherein the composition has a pH equal to or higher than the acid dissociation constant (pKa) of the monocarboxylic acid.