FR2648316A1 - HERBICIDE COMPOSITIONS BASED ON N-PHOSPHONOMETHYLGLYCIN AND THEIR USE - Google Patents

Abstract

Liquid herbicidal compositions characterized in that they consist of aqueous solutions containing: a) N-phosphonomethylcine and / or one of its derivatives in an amount of at least 40 g / l of glyphosate equivalent; and b) a surfactant of formula: (CF DRAWING IN BOPI) in which: R is a straight or branched chain, alkyl or alkenyl, A represents an alkylene group, n, n 'and n' 'are integers such as n + n '+ n' 'is between 1 and 15, R ** 1 is the hydrogen atom or an acyl radical.

Description

The present invention relates to new

  concentrated formulations based on N-

  phosphonomethylglycine or N-group compounds

  phosphonométhylglycyle. D5 N-phosphonomethylglycine (sometimes called glyphosate), as well as analogous compounds, their herbicidal properties and formulations containing them, are described in particular in US Pat. No. 3,799,758. Although many glyphosate derivatives, soluble or insoluble in water are known, in fact it is very generally preferred to use the water-soluble derivatives, and it is for this reason that it is the N-phosphonomethylglycine salts which have generally been developed or marketed,

  especially the isopropylammonium salt.

  More recently (European Patent Application No. 2,90416) attempts have been made to develop concentrates based on N-phosphonomethylcine salts, which may contain N-phosphonomethylglycine in acid form, but

  containing anyway this N-

  phosphonomethylglycine and / or its derivatives in soluble or solubilized forms, these concentrates being characterized by the presence of alkoxylated amine of a particular type. This alkoxylated amine must have at most 12 alkoxy groups per molecule, and must be a surfactant and

  must promote the herbicidal activity of N-derivatives

  phosphonomethylglycine. It can be used in a smaller quantity than the known surfactants of the known formulations of N-phosphonomethylglycine, at least as regards the production of concentrates intended to be applied in the open air, in the form of diluted slurries, in a proportion of 100 to

600 1 / ha.

  An object of the present invention is to provide compositions, or formulations, concentrated (also called concentrates) based on Nphosphonométhylcine, and especially based on its

soluble salts in water.

  Another object of the present invention is

  to supply N-based concentrates

  phosphonomethylglycine or its derivatives giving rise to dilute

herbicidal activity.

  Another object of the invention is to provide

  concentrates based on N-salts

  Another object of the invention is to provide phosphonomethylglycine using new types of surfactants which promote biological activity.

  concentrates based on N-salts

  O20 phosphonomethylglycine using surfactants having an improved solubilization ability Another object of the invention is to provide

  concentrates based on salts of S-

  phosphonomethylglycine using new types of surfactants compatible in concentrated solutions with certain inorganic salts and especially with ammonium sulfate It has now been found that these goals could be achieved in whole or in part with the compositions according to the invention. In the following the percentages are, unless otherwise indicated, percentages by weight. Moreover, the equivalent quantity of glyphosate is called

  product if all the derivative of the N-

  phosphonomethylglycine was in the form of N-

ordinary phosphonomethylglycine.

  These compositions are liquid compositions consisting of aqueous solutions containing: a) N-phosphonomethylcine and / or one of its derivatives in a proportion of at least 40 g / l of glyphosate equivalent, b) a surfactant (having the activator character) of formula (AO) n R '/ R - N <(AO) n' R '

\ /

CH2 -CH2 -CH2 -N

  (A) n "R 'wherein R is a linear or branched chain, alkyl or alkenyl, having 8 to 22 carbon atoms A is alkylene, preferably ethylene or propylene n, n' and n" are numbers integers such that n + n '+ n "is preferably between 1 and 15

between 3 and 12.

  R1 is the hydrogen atom or an acyl radical

  such as formyl, acetyl propanoyl (i.e., CH3-

CH2-CO).

  Of course, this single surfactant can be replaced by a surfactant mixture in which, on average, R, n, n 'and n "respond to

definitions given above.

  Advantageously, the present invention relates to concentrated compositions as described above and furthermore relating to one or other of the following characteristics: ia) N-phosphonomethylglycine is in an amount not exceeding the limit of solubility in the medium considered, preferably between 60 and g / l, and even more preferably between 90 and 150 g / l, b) the concentrated solution comprises an ammonium salt (NH4) such as nitrate, phosphate, sulphamate, thiocyanate or preferably sulphate, at a rate of 50 to 400 g / l, preferably 100

at 300 g / il.

  c) the concentrated compositions are intended to be diluted by the farmers in containers containing water so as to be able to spread these diluted slurries at a rate of 100 to 600 l / ha, the active ingredient being, for its part, applied to 0.125 to 4.5 kg / ha, d) the equivalent weight ratio of the surfactant is between 0.6 and 6, preferably between 1 and 3.

e) the solvent is water.

  The relatively high amount of surfactant indicated above relates to this surfactant with the character of biological activator / herbicide, it being understood that the compositions according to the invention may furthermore contain, as will be specified hereinafter, all sorts of other components, including surfactants (or surfactants) of various natures wetting nature; these surfactants are then used in very high doses

  less than the dose of the activator.

  The concentrated liquid compositions according to the invention are usually prepared by simple

mixing of the constituents.

  The compositions according to the invention usually contain from 5 to 25% (preferably from 7 to 20%) of active ingredients (herbicides), from 0.5 to 40% (preferably from 10 to 20%) of agent (s). surfactant (s) having an activating character, from 10 to 50% (preferably from 20 to 30%) of an ammonium salt (adjuvant), from 0.1 to 10% of surfactant (s) wetting agent, from 0 to 30% of suitable additives, such as antifoams, corrosion inhibitors, sequestering agents, stabilizers, penetrating agents, adhesives. Naturally, the compositions according to the invention may still contain all the solid or liquid additives corresponding to the usual techniques of setting

in formulation.

  According to what has already been said, the concentrated compositions according to the invention may contain one or more surfactants, in addition to the activator surfactant defined above. As surface-active agent, it is possible to use an ionic or nonionic wetting agent or a mixture of such surfactants. There may be mentioned, for example, polycondensates of ethylene oxide with fatty alcohols or with fatty acids or with fatty amines, substituted phenols (in particular alkylphenols or arylphenols), salts of sulphosuccinic acid esters. , taurine derivatives (especially alkyltaurates), phosphoric esters of polyoxyethylated alcohols or phenols, esters of fatty acids and polyols, sulphonates, sulphonates and phosphates functional derivatives of

previous compounds.

  By way of non-limiting example, examples of solutions according to the invention as well as examples of use of these solutions are given below. In these examples the active ingredient is N-phosphonomethylglycine

  in the form of isopropylammonium salt.

EXAMPLE 1

  N-Phosphonomethylglycine in the form of isopropylammonium salt 100 g / l ammonium sulphate 200 g / l - surfactant of formula defined below 100 g / l - water sufficient quantity for 1 1 The surfactant used in this example was a product of the formula (CH 2 -CH 2 -O) n H / C H 3 S-N (CH 2 2 -CH 2 -O) n 'H

\ /

  CH 2 -CH 2 -CH 2 -N (CH 2 -CH 2 -O) n "H with n + n '+ n" = 3

EXAMPLE -2

  - N-Phosphonomethylglycine, in the form of isopropylammonium salt 100 g / l - ammonium sulfate 100 g / 1 - surfactant used in Example 1 200 g / l water quantity sufficient for 1 i

EXAMPLE 3

  N-phosphomethylglycine, in the form of isopropylammonium salt 100 g / l ammonium sulphate 150 g / l - surfactant used in example 1 150 g / l Water sufficient quantity for 1 1

EXAMPLE 4

  N-phosphomethylglycine, in the form of isopropylammonium salt 100 g / l ammonium sulphate 300 g / l-surfactant used in example 1 100 g / 1 water sufficient quantity for 1 1 These solutions are diluted in water at a rate of 2.5 and 5 liters in 300 liters, the slurries thus obtained are sprayed on different plants

weeds.

  The compositions of Examples 1 to 4, used at the dose of 250 g / l of active ingredient counted in the form of N-phosphonomethyl-glycine, have on a variety of weeds, especially Ipomea, purslane and velvetleaf, an efficiency significantly higher than that of commercial products, and in particular of the product marketed under the trademark Round-up and which contains the same active ingredient associated with agents

ordinary surfactants.

Claims (10)

  1) Liquid herbicidal compositions characterized in that they consist of aqueous solutions containing: a) N-phosphonomethylcine and / or one of its derivatives in a proportion of at least 40 g / 1 of glyphosate equivalent, and b) a surfactant of the formula (AO) n R 'R - N (AO) n' R CH2-Cz-CH-CH2-N (AO) n R wherein R is a linear or branched chain, alkyl or alkenyl, having from 8 to 22 carbon atoms A represents an alkylene group, preferably ethylene or propylene n, n 'and n "are integers such that n + n' + n" is between 1 and 15 R 'is the atom hydrogen or an acyl radical such as formyl, acetylpropanoyl 2) Compositions according to claim 1 characterized in that A is an ethylene or propylene group and / or that n + n '+ n "is between 3 and 12 and / or that Ri is an acetyl radical   3) Compositions according to one of claims 1 to 2 characterized in that the N-   phosphonomethylglycine is in an amount not exceeding the solubility limit in the medium and is between 60 and 200 g / 1   4) Compositions according to one of claims 1 to 3 characterized in that the N-   phosphonomethylglycine is in a quantity of between 90 and 150 g / l   ) Compositions according to one of claims 1 to   Characterized in that the concentrated solution comprises an ammonium salt such as nitrate, phosphate, sulphamate, thiocyanate or preferably sulphate, in a proportion of 50 to 400 g / l.   6) Compositions according to one of claims 1 to   Characterized in that the concentrated solution comprises an ammonium salt in a proportion of 100 to 300 g / l.   7) Compositions according to one of claims 1 to   6 characterized in that they are intended to be diluted in water so as to be able to spread these diluted slurries at a rate of 100 to 600 1 / ha, the active ingredient being, in turn, applied at a rate of 0.125 to 4.5 kg / ha   8) Compositions according to one of claims 1 to   7 characterized in that the weight ratio equivalent cly-hosate surfactant is between 0.6 and 6.   9) Compositions according to claim 8 characterized in that the weight ratio is between 1 and 3   ) Compositions according to one of claims 1 to   Characterized in that the solvent is water.   11) Compositions according to one of claims 1 to   characterized in that they comprise other wetting surfactants and / or suitable additives such as antifoams, corrosion inhibitors, sequestering agents, stabilizers, penetrating agents, adhesives and the like.   12) Compositions according to one of claims I to   Characterized in that they comprise from 5 to% of active herbicidal material, from 0.5 to 40% of activating agent (s) surfactant (s), from 10 to 50% of an ammonium salt (adjuvant), from 0.1 to 10% wetting surfactant (s), from 0 to 30% of suitable additives   13) Compositions according to one of claims 1 to   Characterized in that they comprise from 7 to 20% of active herbicidal material, from 10 to 20% of activating agent (s) surfactant (s), from 20 to 30% of ammonium salt 14) Weed control system characterized in that a composition is used   according to one of claims 1 to 13.   Process according to Claim 14, characterized in that the composition is diluted and applied at a rate of 100 to 600 l / ha, the active ingredient being   applied at a rate of 0.125 to 4.5 kg / ha.