Glyphosate formulations

Details Glyphosate formulations Glyphosate formulations

1997-07-23

2001-05-08

Barts, Samuel (Department: 1621)

Plant protecting and regulating compositions

Plant growth regulating compositions

Organic active compound containing

C071SDIG004

Reexamination Certificate

active

06228807

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to dry, water soluble, agriculturally acceptable herbicidal compositions useful for killing and/or controlling weeds and to a process for preparing such compositions. This invention also relates to dry, water soluble or water dispersible, granular, agriculturally acceptable herbicidal compositions containing two or more herbicides, herbicidal methods of use thereof and to a process for preparing such compositions.
DESCRIPTION OF THE PRIOR ART
Glyphosate (N-phosphonomethylglycine) is well known in the art as an effective herbicide. It is also known that glyphosate, an organic acid, is relatively insoluble in water. Glyphosate is typically formulated as a water-soluble salt, especially as the isopropylamine salt (IPA salt) to kill or control weeds or plants. Glyphosate is typically sold commercially as an aqueous concentrate.
Various salts of glyphosate, methods for preparing salts of glyphosate, formulations of glyphosate and methods of use for killing and controlling weeds and plants are disclosed in U.S. Pat. Nos. 3,799,758 and 4,405, 531 issued to John E. Franz on Mar. 26, 1974 and Sep. 20,1983 respectively. Other US patents which disclose salts of glyphosate include U.S. Pat. No. 4, 315,765 issued to George B. Large on Feb. 16, 1982, U.S. Pat. No. 4,507,250 issued to Izak Bakel on Mar. 26, 1985, U.S. Pat. No. 4,397,676 issued to Izhak Bakel on Aug. 9, 1983, U.S. Pat. No. 4, 481, 026 issued to Michael P. Prisbylla on Nov. 6, 1984 and, U.S. Pat. No. 4, 140,513 issued to Erhard J. Prill on Feb. 20, 1979. The aforementioned patents are incorporated herein in their entirety by reference.
EPO published patent application 204146 discloses a herbicidal composition comprising (a) 2-(4-chloror-2-fluror 5-propargyloxyphe-nyl)-5,6,7, 8-tetrahydro-1H-1,2,4-triazolo (1,2-s)phridazine -1,3,-2H-dione (I), with (b) glyphosate (i) glufosinate (ii) bialaphos (iii) and/or paraquat (iv) or their salts and an inert carrier or diluent.
EPO published patent application 255760 discloses a granule shaped agricultural composition prepared by introducing to the top of a drying tower, a mixture of the agricultural chemical, an anionic surfactant and optionally one or more additives in the form of a concentrated solution or an aqueous slurry.
Published Japanese patent applications J62175407 and J62175408 disclose a herbicide containing solid carrier, additives and herbicidal component and has a particle size of 48-150 mesh. Disclosed herbicidal components are ((3-amino-3-carboxy)propyl-1)methylphosphonic acid, N-(phosphonomethyl)glycine, (2-amino-4-methylphosphino-butyral) alanylalanine and their salts.
Published European Patent Application 0 206 537 discloses a solid, substantially non-hygroscopic, phytoactive composition comprising an intimate mixture of a phytoactive N-phosphonomethyl-N-carboxymethyl compound and a surfactant which is solid at ambient temperatures.
Published European Patent Application 0 256 608 discloses a method for the preparation of a solid, phytoactive composition comprising (a) reacting an acid form of a phytoactive N-phosphonomethyl-N-carboxymethyl compound with a liquid amine to form the amine salt of said N-phosphonomethyl-N-carboxymethyl compound (b) admixing said amine salt of said N-phosphonomethyl-N- carboxymethyl compound with a molten surfactant, the surfactant being solid at ambient temperature and (c) cooling said mixture to a temperature below the melting point of the surfactant to form a composition comprising said surfactant and said amine salt of N-phosphonomethyl-N-carboxylmethyl compound interdispersed in the matrix thereof and which is solid at ambient temperatures.
EPO Publication No. WO 87/04595 discloses a herbicidal water-soluble dry particulate glyphosate formulation comprising the sodium salt of glyphosate and a surface active agent of the formula:
wherein R
1
and R
2
are independently methyl or ethyl, R
3
is methyl, ethyl benzyl or C
10
to C
18
alkyl, R
4
is C
10
to C
18
alkyl and X is chloro or bromo.
Japanese LOP 145 205-88 (the equivalent of EPO274369) discloses an aqueous concentrate herbicidal formulation comprising a water soluble glyphosate salt, ammonium sulfate and a quaternary ammonium salt.
PCT/WO 87-04,712 discloses a method of preparing a particulate alkali metal salt of N-phosphonomethylglycine which comprises adding a solid alkali metal base with agitation to N-phosphonomethylglycine containing up to 25% water.
Research Disclosure Publication 27161 November 1986 “Novel Glyphosate acid wettable powder formulation effective in control of weeds” discloses a formulation comprising N-phosphonomethylglycine, nonionic surfactant, diatomaceous earth, inorganic salt (ammonium sulphate) and an antifoaming agent.
Chemical Abstracts 103: 191395K (1985) Davydov, A. M.; Vechtomova, T. N.; Banzunova, G. G. (USSR). Sashch. Rast. (Moscow) 1985, (9), 40-1 (Russ) discloses that the 36% aq. soln. Utal (I) [96638-41-4] and the 50% wettable powder Fosulen (II) are Soviet brands of glyphosate.
SUMMARY OF THE INVENTION
The invention comprises a dry, water soluble, agriculturally acceptable herbicidal composition comprising a water soluble salt of N-phosphonomethylglycine as a water-dispersible granule, water soluble granule, or water-dispersible powder or water soluble powder although water soluble granules are preferred. The composition comprises a water soluble salt of N-phosphonomethylglycine and additionally one or more liquid surfactants. In another embodiment, the invention further comprises said composition containing water.
Compositions of this invention may further comprise ammonium sulfate, potassium sulfate, potassium chloride, sodium sulfate, urea, mixtures thereof and the like. The composition may optionally include a synergist, quick-burn additive, a humectant, a co-herbicide, a dye, pigment, corrosion inhibitor, thickener, dispersing agent, calcium sequestrant, defoamer, mixtures thereof and the like. When employing two or more herbicides in the composition, the composition of this invention may be a water soluble or a water dispersible granule. If at least one of two or more herbicides employed herein is relatively insoluble in water, likely a water dispersible composition is preferred.
In a process for preparing the composition of this invention, the dry, water soluble, granular, agriculturally acceptable composition is prepared by pan, extrusion, fluid bed (or equivalent) granulation of N-phosphonomethylglycine, and surfactant, or a water soluble salt of N-phosphonomethylglycine, optionally with a surfactant.
In another embodiment of this invention, said composition is prepared by admixing N-phosphonomethylglycine or an agriculturally acceptable salt of N-phosphonomethylglycine with one or more liquid surfactants.
In another method of preparing the compositions of this invention, one may admix ingredients with water and thereafter spray dry to give a granular product.
In another method of preparing the compositions of this invention, one may admix the ingredients with water and drum dry on a flaking roll and grind the flaked composition to give a granular composition.
Yet another method of preparing the granular compositions of this invention involves admixing glyphosate and base, for example ammonium bicarbonate, with water, crystallizing, centrifuging and blending in the surfactant and drying the granular product.
Even yet another method for preparing the granular composition of the invention, involves carrying out the reaction of the ingredients in a fluid bed drier using glyphosate wet cake or moistened glyphosate containing a minimum of moisture to provide occurrence of the neutralization phase of the process and then completion by drying to give the granular product.
Compositions may be optionally mixed with ammonium sulfate and optionally one or more additional herbicides and thereafter these ingredients blended to form said admixed composition. The order of addition of the ingredients to the starting material, typically glyphosate or a water soluble salt thereof is not cr

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