Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1994-12-09
1996-10-29
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
71DIG1, A01N 5704, A01N 2514
Patent
active
055696392
DESCRIPTION:
BRIEF SUMMARY
This application has been filed under 35 U.S.C. 371 from the international application PCT/U.S.93/05370 (WO 93/25081).
The present invention comprises a dry flowable agricultural composition of N-(phosphonomethyl)glycine (defined hereinafter as glyphosate) with and without a sulfonylurea herbicide and processes for the preparation of the composition without a drying step.
WO91/13546 discloses the preparation of dry flowable agricultural compositions comprising an active ingredient, binder and chemical stabilizer. Among the active ingredients disclosed are various sulfonylureas and N-(phosphonomethyl)glycine (glyphosate) with a disclosure that one or more may be used.
While generally useful for granulation without drying, WO91/13546 would not be useful for processing wetcake glyphosate or wet glyphosate salt without treatment according to the present invention.
WO90/07275 describes the preparation of glyphosate compositions or glyphosate salt granule compositions containing liquid surfactants. The ability to utilize a co-herbicide in the compositions is disclosed, and several sulfonylurea herbicides, including metsulfuron methyl, are specifically named.
The processes of the prior art have the disadvantage of requiring a drying step at some stage of production of the formulations disclosed and because the final products contain environmentally-sensitive chemicals such as sulfonylureas and other potentially volatile components, large and expensive air-purification systems are necessary in drying operations to prevent untoward chemical release.
SUMMARY OF THE INVENTION
The compositions of the invention are dry flowable agricultural compositions comprising glyphosate or glyphosate salt with a sulfonylurea. The process of the invention produces a free flowing granular composition without a drying step by heating. The resulting granules can also be described as free flowing, non-caking, low attrition glyphosate compositions.
A process for the preparation of a dry flowable agriculturally suitable composition whose pH when measured by a 1% by weight aqueous solution of the composition is 4 or higher which comprises a process selected from process A and process B, said process A comprising
(4) 0-1% of an anti-foaming agent to form a mixture I, wet glyphosate salt to form a blended mixture I, ingredients provided when a sulfonylurea is present the stabilizer is 0.1-20%.
The process of the invention is more advantageous when the glyphosate is a wetcake. Most preferably, the process of the invention is by process B. However, the process of the invention can also be carried out with glyphosate that has been previously dried because even when using dry glyphosate the resulting composition using some prior art methods would require drying. The processes of the invention do not require drying of the composition made from dry or from wet glyphosate. Preferably, the process of the invention is carried out with the presence of a sulfonylurea herbicide and stabilizer, but it also can be carried out without a sulfonylurea herbicide and without a stabilizer.
Another embodiment of the invention is a free flowing, non-caking, low attrition agriculturally suitable glyphosate composition comprising in weight percent based on the total composition weight than or equal to 4.
A preferred composition comprises, in weight precent based on total formulation weight, the above composition comprising: than or equal to 4.
Anhydrous base salts in the compositions may convert free water to crystalline waters of hydration.
When a glyphosate salt is used, the preferred cation is sodium.
A preferred composition is that in which the base salt is an anhydrous sodium salt.
In addition, a preferred composition comprises a stabilizer which is sodium metasilicate.
A preferred binder is one selected from the class consisting of ethylene oxide/propylene oxide copolymer, polyethoxylated dinonylphenol, polyethylene glycol and mixtures of the foregoing.
Both glyphosate and the sulfonylureas hereinafter described are known herbicides.
What is meant by glyp
REFERENCES:
patent: 4913722 (1990-04-01), Felix et al.
patent: 4931080 (1990-06-01), Chan et al.
patent: 5089045 (1992-02-01), Bush et al.
patent: 5372989 (1994-12-01), Geigle et al.
Clardy S. Mark
E. I. Du Pont de Nemours and Company
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