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Glyphosate formulations containing amidoalkylamine surfactants

a technology of amidoalkylamine and surfactants, which is applied in the field of herbicidal compositions comprising glyphosate, can solve the problems of reducing bioefficacy, difficult to formulate high-load concentrates employing, and difficult to develop concentrated glyphosate formulations in the range of 480 g a.e./l to 540 g a.e./l, and achieves high glyphosate and surfactant loads

Inactive Publication Date: 2010-05-06
MONSANTO TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Among the various aspects of the present invention may be noted the provision of bio-efficacious herbicidal compositions having high glyphosate and surfactant loads. The herbicidal compositions of the invention are stable when formulated as herbicidal concentrates and when tank-mixed with co-herbicides. The present invention further provides herbicidal compositions characterized by reduced toxicity and reduced eye irritation. The herbicidal compositions of the invention are further compatible with a variety of glyphosate salts, for example, the potassium salt, the diammonium salt, the monoethanolamine salt, or combinations thereof.

Problems solved by technology

However, the development of concentrated glyphosate formulations in the range of 480 g a.e. / L to 540 g a.e. / L is challenging due to the limited compatibility of surfactants at high glyphosate loadings.
It is particularly challenging to formulate high load concentrates employing the potassium glyphosate salt or the diammonium glyphosate salt.
Current commercial diammonium glyphosate formulations typically contain from 360 g a.e. / L to 369 g a.e. / L glyphosate and employ relatively costly quaternary ammonium surfactants.
Problematically, low glyphosate loading coupled with low surfactant concentrations yields formulations characterized by reduced bioefficacy as compared to commercial formulations known in the art.

Method used

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  • Glyphosate formulations containing amidoalkylamine surfactants
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Examples

Experimental program
Comparison scheme
Effect test

example 1

Formulation Viscosity

[0149]The viscosities of various diammonium glyphosate salt formulations were determined as a function of surfactant type and surfactant concentration. Viscosity with respect to temperature was measured using TA Instruments, AR 2000 Rheometer. Five glyphosate formulations containing various loadings of C8-10 amidopropyl dimethylamine, Adsee C80W (cocoamidopropyl dimethylamine), and a blend of surfactants (Ethoquad C / 12 and an alkoxylated fatty alcohol) available in a commercial glyphosate formulation (labeled “blend” in Table 1 and FIG. 1) were studied using a step-flow procedure where temperature was ramped up from 0° C. to 10° C. and then to 20° C. Comparisons were made at the 20° C. measurement. No viscosity increase was observed in any 360 g a.e. / L or 369 g a.e. / L formulation regardless of surfactant type. Higher loading glyphosate formulations (480 g a.e. / L) were also prepared having the components shown in Table 1:

TABLE 1GlyphosateSurfactantGlyphosateconce...

example 2

Greenhouse Bioefficacy Data of Glyphosate Formulations Containing Adsee C80W

[0153]Glyphosate formulations containing Adsee C80W were prepared and tested for bioefficacy. The bioefficacy of the formulations containing Adsee C80W were compared to Roundup® Original and two formulations containing blends of Ethoquad surfactants (available from Akzo Nobel). Bioefficacy evaluations were done on common purslane (POROL) at application rates of 280 g a.e., 560 g a.e., and 841 g a.e. per hectare of glyphosate, respectively, as shown from left to right for each formulation in FIG. 2.

[0154]In each formulation, the source of glyphosate was diammonium glyphosate salt. In two formulations, ethoxylated quaternary amines were blended with Adsee C80W to improve bioefficacy. In another formulation, Adsee C80W was coupled with the alkypolyglucoside surfactant 2-ethyl-1-hexylglycoside (Akzo Nobel). In still another formulation, Adsee C80W was used as the only surfactant. The compositions of each formula...

example 3

Greenhouse Bioefficacy Data of Glyphosate Formulations Containing C8-10 Amidopropyl Dimethylamine

[0156]High load glyphosate formulations containing C8-10 amidopropyl dimethylamine surfactant were prepared and tested for bioefficacy. The efficacies of formulations containing C8-10 amidopropyl dimethylamine surfactant were compared against commercially available glyphosate formulations, two standard formulations, and two additional test formulations containing blends of quaternary amine surfactants. In each formulation, the source of glyphosate was diammonium glyphosate salt. Formulation details are summarized in Table 3.

[0157]Formulations 163A, 163B, and 163C contained a blend of C8-10 amidopropyl dimethylamine (“C8-10 APA” in Table 3) and a blend of quaternary tallowamine ethoxylate (Ethoquad T / 20) and quaternary cocoamine (Ethoquad C / 12) in a weight ratio of 70:30. This is designated “blend” in Table 3. The ratio of C8-10 amidopropyl dimethylamine and blend were varied in each of f...

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PUM

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Abstract

An herbicidal composition comprising (a) glyphosate or a derivative thereof, (b) an amidoalkylamine surfactants having the general structure:wherein R1 is a hydrocarbyl having from about 1 carbon atoms to about 22 carbon atoms, and R2, R3, and R4 are each independently hydrocarbyl having from about 1 carbon atom to about 6 carbon atoms; and (c) at least one co-surfactant.

Description

[0001]This application claims the benefit of U.S. provisional application Ser. No. 61 / 100,961, filed Sep. 29, 2008, the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention generally relates to herbicidal compositions comprising glyphosate and more specifically, to herbicidal compositions comprising glyphosate and surfactant blends particularly tailored to increase the stability of and reduce the toxicity of the herbicidal compositions.BACKGROUND OF THE INVENTION[0003]N-phosphonomethylglycine (“glyphosate”) is an effective post-emergent foliar-applied herbicide. In its acid form, the structure of glyphosate is:[0004]Since glyphosate in its acid form is relatively insoluble in water (1.16% by weight at 25° C.), it is typically formulated as a water-soluble salt.[0005]Glyphosate is typically formulated as a monobasic, dibasic, or tribasic salt. Various salts of glyphosate, methods for preparing salts of glyphosate, formulation...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01N57/18A01P13/00
CPCA01N57/20A01N25/30A01N39/04A01N47/30A01N2300/00
Inventor HEMMINGHAUS, JOHNABRAHAM, WILLIAMWRIGHT, DANIEL R.
Owner MONSANTO TECH LLC
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