Enhanced method of killing weeds with glyphosate herbicide

A - Human Necessities – 01 – N

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A01N 57/20 (2006.01) A01N 25/30 (2006.01)

Patent

CA 2383746

A method is provided of enhancing the herbicidal activity of a glyphosate herbicide, comprising adding to the glyphosate herbicide a mixture of a first surfactant and a second surfactant at a weight ratio of total surfactant to glyphosate of about 1:30 to about 2:1, wherein the first surfactant has a chemical structure comprising a cationic or protonatable amino group and a C8-24 linear or branched, saturated or unsaturated hydrocarbyl group, and the second surfactant has the formula R-CO-NR'-(CR'2)n-COOM where R is a C7-23 linear or branched, saturated or unsaturated hydrocarbyl group, n is 1 to 4, M is hydrogen or a cationic counterion, and R' groups are each independently hydrogen, C1-4 alkyl or a group -(CH2)m- COOM where m is 1 to 4 and M is as defined imme- diately above, with the proviso that no more than one R' group is such a group -(CH2)m-COOM; the weight ratio of the first to the second surfactant being about 1:10 to about 10:1. Also provided is a herbicidal composition prepared according to the above method. The first and second surfactants exhibit a synergistic interaction in enhancing herbicidal activity of the glyphosate herbicide.

L'invention concerne un procédé permettant d'améliorer l'action herbicide de l'herbicide glyphosate, qui comporte l'adjonction d'un mélange d'un premier surfactant et d'un second surfactant à l'herbicide glyphosate, à un rapport en poids de surfactant total au glyphosate d'environ 1/30 à 2/1. Selon ce procédé le premier surfactant possède une structure chimique composée d'un groupe cationique ou d'un groupe amino-protonable et d'un groupe hydrocarbyle saturé ou insaturé, linéaire ou ramifié C8-24 et d'un second surfactant dont la formule est R-CO-NR'-(CR'2)n-COOM dans laquelle R représente un groupe hydrocarbyle, saturé ou insaturé, linéaire ou ramifié C7-23, n est compris entre 1 et 4, M représente un contre-ion hydrogène ou cationique, et les groupes R' sont indépendamment les uns des autres, hydrogène, C1-4 alkyle ou un groupe -(CH2)m-COOM dans lequel m est compris entre 1 et 4 et M est tel qu'il est défini immédiatement ci-dessus, à condition que pas plus d'un groupe R' ne soit pareil à un groupe -(CH2)m-COOM; le rapport de poids du premier surfactant au second étant environ de 1/10 à 10/1. L'invention concerne également une composition herbicide préparée conformément au procédé décrit ci-dessus. Le premier et le second présentent une interaction synergiste, qui augmente l'action herbicide de l'herbicide glyphosate.

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