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Publication Number
US-9089132-B2
Publication Date
2015-07-28
Expiration Date
Abstract
Ethoxylated fatty acid mono-ester(s) of sorbitan with a fatty acid chain length from 8 to 14 and an overall degree of ethoxylation from 7 to 16 are new (though related to the polysorbates). These compounds are useful as adjuvants in agrochemical formulations, particularly combination formulations of herbicides having differing weed control effects, notably of non-selective herbicide and selective herbicide; particularly selective herbicide, particularly selective broadleaf herbicide, and graminicide; and selective graminicide and non-selective herbicide, especially a combination of a glyphosate type non-selective water soluble herbicide with a clethodim type selective (graminicide) herbicide, particularly to reduce or eliminate antagonism between differing types of herbicide. Formulations including such herbicide combinations and the adjuvant compounds are particularly useful in controlling weed including volunteer glyphosate resistant maize in subsequently sown glyphosate resistant soya.
Core Innovation
The invention relates to ethoxylated fatty acid mono-ester(s) of sorbitan as agrochemical adjuvants in agrochemical formulations. The ethoxylated fatty acid mono-ester(s) have a fatty acid carbon chain length from 8 to 14 and an overall degree of ethoxylation on average from 7 to 16, and are used to address antagonism when co-formulating herbicide combinations.
The problem addressed is biological antagonism in co-formulated herbicide combinations, in particular antagonism between a non-selective herbicide and another agrochemical active when formulated together. The document discusses antagonism especially where the other active is a graminicide, and also where a selective herbicide or a selective broadleaf herbicide is co-formulated with a graminicide.
The formulation comprises the ethoxylated fatty acid mono-ester(s) of sorbitan together with at least two agrochemical actives selected from non-selective herbicide with another type of agrochemical active, selective herbicide with a graminicide, selective broadleaf herbicide with a graminicide, or a graminicide with a non-selective herbicide. The ethoxylated sorbitan mono-ester(s) are also defined by a formula (I) describing an EO-containing sorbitan residue and constraints on the average ethyleneoxy substitution levels and the possible substituent groups.
Claims Coverage
The independent claim coverage consists of two independent claim sets, one covering an agrochemical formulation and one covering ethoxylated fatty acid mono-ester(s) of sorbitan defined by formula (I). Across these, the main inventive features include the specific ethoxylated sorbitan mono-ester parameter ranges and co-formulated herbicide/graminicide active combinations.
Agrochemical formulation with ethoxylated sorbitan mono-esters and co-formulated herbicide/graminicide actives
An agrochemical formulation comprising ethoxylated fatty acid mono-ester(s) of sorbitan having fatty acid carbon chain length from 8 to 14 and overall degree of ethoxylation on average from 7 to 16, and at least two agrochemical actives used in a co-formulation selected from: non-selective herbicide and another type of agrochemical active; selective herbicide and a graminicide; selective broadleaf herbicide and a graminicide; or a graminicide and a non-selective herbicide.
Ethoxylated sorbitan mono-esters defined by formula (I) with constrained average EO substitution and C7–C13 acyl options
A compound or mixture of compounds which is/are ethoxylated fatty acid mono-ester(s) of sorbitan and are compounds represented by formula (I) comprising an EO-containing sorbitan residue wherein n1, n2, n3, and n4 each independently represent average values from 0 to 10, the total n1+n2+n3+n4 has an average value from 8 to 12, and R1, R2, R3, and R4 each independently represents H or an acyl group —C(O)—R5 where R5 is a C7 to C13 hydrocarbyl.
Taken together, the claims cover an agrochemical formulation combining defined ethoxylated fatty acid mono-ester(s) of sorbitan with specified co-formulated herbicide/graminicide active pairings, and the underlying ethoxylated sorbitan mono-ester compounds themselves as defined by formula (I) with constrained average EO substitution and optional C7–C13 acyl groups.
Stated Advantages
Overcome biological antagonism in co-formulated herbicide combinations.
Improved volunteer maize control with a performance plateau/peak compared to conventional Tween adjuvants.
Documented Applications
Co-formulated herbicide applications involving glyphosate-type non-selective herbicides with graminicides such as clethodim, and similar antagonism relationships between glufosinate/broadleaf herbicides (bentazon, bromoxynil, 2,4-D amine) and graminicides (quizalofop, sethoxydim).
Field application in glyphosate-resistant soya/maize rotation, including tank-mixing glyphosate + clethodim together with adjuvants SE1 (8-EO), SE2 (12-EO), and SE3 (16-EO).
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