Glyphosate composition for dicamba tank mixtures with improved volatility
Herbicidal concentrate compositions containing glyphosate salts and tank mix compositions containing a combination of glyphosate salt and dicamba salt herbicides are described. A method of preparing a tank mix composition comprising a glyphosate component and a dicamba component is also described. The method includes combining a glyphosate concentrate composition, a dicamba composition comprising one or more salts of dicamba and dilution water to form the tank mix composition. The glyphosate concentrate composition comprises a glyphosate salt selected from the group consisting of the monoethanolamine salt, the potassium salt, and mixtures thereof at a glyphosate loading of at least about 240 grams acid equivalent per liter (g a.e./l), and the pH of a 5 wt. % acid equivalent dilution of the glyphosate concentrate composition is from about 5 to about 6.5.
1. An aqueous glyphosate concentrate composition comprising:
(a) a mixture of monobasic and dibasic monoethanolamine salts of glyphosate and wherein the molar ratio of monobasic monoethanolamine glyphosate salt to dibasic monoethanolamine glyphosate salt is from about 1:1 to about 3:1, wherein the loading of monoethanolamine glyphosate salts is at least about 240 grams acid equivalent per liter (g a.e./l.); and
(b) one or more surfactants selected from the group consisting of:
(1) a quaternary ammonium salt;
(2) an alkoxylated tertiary etheramine;
(3) an alkylpolysaccharide; and
(4) an amidoalkylamine, and
wherein the pH of a 5 wt. % acid equivalent dilution of the aqueous glyphosate concentrate composition is from about 5 to about 6.5.
2. The aqueous glyphosate concentrate composition of claim 1 wherein the pH of a 5 wt. % acid equivalent dilution of the glyphosate concentrate composition is from about 5.2 to 5.8.
3. The aqueous glyphosate concentrate composition of claim 1 wherein the pH of a 5 wt. % acid equivalent dilution of the glyphosate concentrate composition is from about 5.2 to about 5.6.
4. The aqueous glyphosate concentrate composition of claim 1 wherein the loading of monoethanolamine glyphosate salts is at least about 360 g a.e./1.
5. The aqueous glyphosate concentrate composition of claim 1 wherein the loading of monoethanolamine glyphosate salts is from about 360 g a.e./1 to about 550 g a.e./l.
6. The aqueous glyphosate concentrate composition of claim 1 wherein the loading of monoethanolamine glyphosate salts is from about 400 g a.e./1 to about 540 g a.e./l.
7. The aqueous glyphosate concentrate composition of claim 1 wherein the surfactant concentration is from about 1 wt. % to about 20 wt. %.
8. The aqueous glyphosate concentrate composition of claim 1 wherein the surfactant concentration is from about 2.5 wt. % to about 10 wt. %.
9. The aqueous glyphosate concentrate composition of claim 1 wherein the molar ratio of monobasic monoethanolamine glyphosate salt to dibasic monoethanolamine glyphosate salt is from about 1:1 to about 2:1.
10. The aqueous glyphosate concentrate composition of claim 1 wherein the molar ratio of monobasic monoethanolamine glyphosate salt to dibasic monoethanolamine glyphosate salt is from about 1.5:1 to about 3:1.
11. The aqueous glyphosate concentrate composition of claim 1 wherein the composition comprises the quaternary ammonium salt.
12. The aqueous glyphosate concentrate composition of claim 11 wherein the quaternary ammonium salt has the structure of formula (I):
wherein R 1 is hydrocarbyl or substituted hydrocarbyl having from 1 to about 30 carbon atoms; R 2 in each of the (R 2 O) x and (R 2 O) y groups is independently C 2 -C 4 alkylene; R 3 is hydrogen, or a linear or branched alkyl group having from 1 to about 4 carbon atoms; R 4 is hydrocarbyl or substituted hydrocarbyl having from 1 to about 30 carbon atoms; x and y are independently an average number from 1 to about 40; and X − is an agriculturally acceptable anion.
13. The aqueous glyphosate concentrate composition of claim 1 wherein the composition comprises the alkoxylated tertiary etheramine.
14. The aqueous glyphosate concentrate composition of claim 13 wherein the alkoxylated tertiary etheramine has the structure of formula (II):
wherein R 1 is a hydrocarbyl or substituted hydrocarbyl having from about 4 to about 22 carbon atoms; R 6 and R 7 are each independently a hydrocarbylene having 2, 3, or 4 carbon atoms; each R 8 is independently hydrogen or C 1-6 alkyl; m is an average number from about 1 to about 10; and the sum of x and y is an average value ranging from about 2 to about 60.
15. The aqueous glyphosate concentrate composition of claim 1 wherein the composition comprises the alkylpolysaccharide.
16. The aqueous glyphosate concentrate composition of claim 15 wherein the alkylpolysaccharide surfactant has the structure of formula (III):
R 9 —O-(sug) u (III)
wherein R 9 is a straight or branched chain substituted or unsubstituted hydrocarbyl having from about 4 to about 22 carbon atoms selected from alkyl, alkenyl, alkylphenyl, alkenylphenyl; the sug moiety is a saccharide residue; and u is an average number from 1 to about 10.
17. The aqueous glyphosate concentrate composition of claim 1 wherein the composition comprises the amidoalkylamine.
18. The aqueous glyphosate concentrate composition of claim 17 wherein the amidoalkylamine has a structure of formula (IV):
wherein R 10 is a hydrocarbyl or substituted hydrocarbyl having from 1 to about 22 carbon atoms; R 11 and R 12 are each independently hydrocarbyl or substituted hydrocarbyl having from 1 to about 6 carbon atoms; and R 13 is hydrocarbylene or substituted hydrocarbylene having from 1 to about 6 carbon atoms.
19. The aqueous glyphosate concentrate composition of claim 1 wherein the composition comprises two or more surfactants selected from the group consisting of:
(1) a quaternary ammonium salt;
(2) an alkoxylated tertiary etheramine;
(3) an alkylpolysaccharide; and
(4) an amidoalkylamine.
20. The aqueous glyphosate concentrate composition of claim 1 wherein the composition does not contain a sodium salt of glyphosate.