Enhanced glyphosate herbicidal concentrates
A herbicidal concentrate of a glyphosate di-salt and an enhancement agent is obtained by adjusting the pH of a concentrate containing a glyphosate salt until a single-phase concentrate is obtained. The amount of base added to the concentrate is generally the amount necessary to render a pH of about 7.0 to 8.5 to the concentrate.
1. A single-phase herbicidal concentrate comprising an aqueous solution of a glyphosate di-salt and at least one ammonium compound represented by the formula R 1 COO − X + wherein R 1 is a C 7 to C 11 hydrocarbyl group, optionally substituted with one or more hydroxyl or C 1 -C 5 hydrocarbyl groups and X is ammonium, wherein the following conditions exist:
(a) the amount of glyphosate di-salt in the herbicidal concentrate is between about 10 to about 50 weight percent;
(b) the amount of the at least one ammonium compound in the herbicidal concentrate is between from about 16 to about 52 weight percent; and
(c) the pH of the herbicidal concentrate is from 7.0 to about 8.5.
2. The herbicidal concentrate of claim 1 , wherein the weight ratio of glyphosate di-salt: ammonium compound in the concentrate is between from about 1:1 to about 1:2.
3. The herbicidal concentrate of claim 1 , wherein the ammonium compound is an ammonium salt of caprylic, pelargonic, capric, undecanoic or lauric acid.
4. The herbicidal concentrate of claim 1 , wherein the ammonium compound is ammonium pelargonate.
5. The herbicidal concentrate of claim 1 , wherein R 1 of the ammonium compound is a saturated hydrocarbyl group.
6. The herbicidal concentrate of claim 1 , wherein the glyphosate di-salt is a diammonium salt of glyphosate.
7. The herbicidal concentrate of claim 1 , wherein the glyphosate di-salt is the isopropylamine di-salt of glyphosate.
8. A basic single phase herbicidal concentrate comprising 10-50% isopropylammonium glyphosate di-salt and 16-52% ammonium pelargonate, wherein the pH of the herbicidal concentrate is that sufficient to render a single-phase concentrate.
9. The herbicidal concentrate of claim 8 , wherein the pH of the herbicidal composite is from about 7.0 to about 8.5.
10. The herbicidal concentrate of claim 8 , wherein the weight ratio of the glyphosate salt ammonium compound in the concentrate is between from about 1:1 to about 1:2.
11. A method of preparing a single-phase herbicidal concentrate of a glyphosate salt which comprises introducing a sufficient amount of base to a concentrated mixture of a mono-salt of glyphosate and an ammonium compound of the formula R 1 COO − X + wherein R 1 is a C 7 to C 11 hydrocarbyl group, optionally substituted with one or more hydroxyl or C 1 -C 5 hydrocarbyl groups and X is ammonium until a single-phase concentrate comprising a glyphosate di-salt is obtained.
12. The method of claim 11 , wherein the amount of base added to the concentrated mixture is that sufficient to raise the pH of the concentrated mixture to between from about 7.0 to about 8.5.
13. The method of claim 11 , wherein the ammonium compound is an ammonium salt of caprylic, capric, pelargonic, undecanoic, or lauric acid.
14. The method of claim 11 , wherein the ammonium compound is ammonium pelargonate.
15. The method of claim 11 , wherein the glyphosate di-salt is the diammonium salt of glyphosate.
16. The method of claim 11 , wherein the glyphosate di-salt is the isopropyl amine di-salt of glyphosate.
17. The herbicidal concentrate of claim 1 , wherein the glyphosate di-salt is the ammonium, isopropyl ammonium glyphosate di-salt.