Glyphosate salt herbicidal composition
A herbicidal composition comprises in aqueous solution a mixture of salts of glyphosate at a total glyphosate a.e. concentration not less than about 360 g/l, wherein (a) said glyphosate is in anionic form accompanied by low molecular weight non-amphiphilic cations in a total molar amount of about 100% to about 120% of the molar amount of said glyphosate; (b) said cations comprise potassium and propylammonium (e.g., isopropylammonium) cations in a mole ratio of about 70:30 to about 90:10; and (c) said potassium and propylammonium cations together constitute about 90 to 100 molar percent of all of said low molecular weight non-amphiphilic cations in the composition.
1. A herbicidal composition comprising in aqueous solution a mixture of salts of glyphosate at a total glyphosate acid equivalent concentration of about 360 g/l or greater than 360 g/l, wherein (a) said glyphosate is in anionic form accompanied by low molecular weight non-amphiphilic cations in a total molar amount of about 100% to about 120% of the molar amount of said glyphosate; (b) said cations comprise potassium and propylammonium cations in a mole ratio of 70:30 to 90:10; and (c) said potassium and propylammonium cations together constitute about 90 to 100 molar percent of all of said low molecular weight non-amphiphilic cations in the composition.
2. The composition of claim 1 wherein the propylammonium cations consist of n-propylammonium cations, isopropylammonium cations or a mixture thereof.
3. The composition of claim 1 wherein the propylammonium cations are isopropylammonium cations.
4. The composition of claim 3 having a total glyphosate acid equivalent concentration of about 400 g/l to about 650 g/l.
5. The composition of claim 3 having a total glyphosate acid equivalent concentration of about 450 g/l to about 600 g/l.
6. The composition of claim 3 having a total glyphosate acid equivalent concentration of about 500 g/l to about 600 g/l.
7. The composition of claim 3 wherein the mole ratio of potassium to propylammonium cations is about 75:25 to about 85:15.
8. The composition of claim 1 , further comprising at least one surfactant, wherein the weight ratio of glyphosate acid equivalent to total surfactant is about 10:1 or less than 10:1.
9. The composition of claim 8 , wherein the weight ratio of glyphosate acid equivalent to total surfactant is about 6:1 or less than 6:1.
10. The composition of claim 8 wherein the at least one surfactant is selected from the group consisting of polyoxyethylene fatty amines having 2 to about 12 moles of ethylene oxide per mole of fatty amine, alkyletheramines, quaternary ammonium surfactants, polyoxyethylene alkylphenols, alkyl polyglycosides, alkylbetaines, alkylamine oxides and mixtures thereof.
11. The composition of claim 8 having a cloud point of about 45° C. or higher than 45° C.
12. The composition of claim 8 having a cloud point of about 60° C. or higher than 60° C.
13. The composition of claim 8 exhibiting acceptable tank-mix compatibility with at least one coherbicide formulated as a suspension concentrate and selected from the group consisting of atrazine, diuron, fluometuron and prometryn.
14. The composition of claim 1 exhibiting substantially no ice formation when stored for 24 hours at a temperature of −25° C. or higher.
15. The composition of claim 1 having in absence of surfactant a viscosity at 0° C. of about 300 cP or lower than 300 cP.
16. The composition of claim 1 having in absence of surfactant a viscosity at 0° C. of about 100 cP or lower than 100 cP.
17. A tank-mix herbicidal composition comprising, in an aqueous application medium, a glyphosate herbicide and a coherbicide of low water solubility, the composition being prepared by a process comprising admixing in a suitable vessel with agitation:
(i) water in an amount suitable for application to a plant and/or soil surface by spraying;
(ii) a herbicidally effective amount of an aqueous concentrate herbicidal composition comprising in aqueous solution a mixture of salts of glyphosate at a total glyphosate a.e. concentration of about 360 g/l or greater than 360 g/l, wherein (a) said glyphosate is in anionic form accompanied by low molecular weight non-amphiphilic cations in a total molar amount of about 100% to about 120% of the molar amount of said glyphosate; (b) said cations comprise potassium and propylammonium cations in a mole ratio of 70:30 to 90:10; and (c) said potassium and propylammonium cations together constitute about 90 to 100 molar percent of all of said low molecular weight non-amphiphilic cations in the composition; said composition further comprising as a major or sole surfactant component a polyoxyethylene tertiary amine or etheramine surfactant comprising on average about 7 or more than 7 EO units; and
(iii) a herbicidally effective amount of a suspension concentrate formulation comprising the coherbicide.
18. The composition of claim 17 wherein the mole ratio of potassium to propylammonium cations is about 2.5:1 to about 7.5:1.
19. The composition of claim 1 wherein the mole ratio of potassium to propylammonium cations is about 2.5:1 to about 7.5:1.