Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1997-09-12
1999-10-12
Pak, John
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
504142, 504144, 504145, 504146, 71DIG1, A01N 4340, A01N 3710
Patent
active
059654872
DESCRIPTION:
BRIEF SUMMARY
This invention relates to the field of agricultural chemicals, and in particular to the formulation of compositions of agricultural chemicals in forms convenient for application, by conventional spray techniques. Many agricultural chemicals, particularly herbicides, are water-insoluble, and their formulation into compositions which can be applied conveniently in the field therefore generally involves the use of various adjuvants and carriers, including, in particular, organic solvents. Organic solvents are, however, increasingly thought to be environmentally unacceptable, and much effort has been applied in recent years to the production of agricultural formulations which contain no organic solvents, or at least which have only low levels of organic solvents
Attempts have also been made in recent years to co-formulate two or more herbicidally active compounds, in order to provide compositions with a broader spread of activity that can be achieved by use of one compound alone.
U.S. Pat. No. 4,637,830 is concerned with a herbicidal concentrate which addresses some of these needs, and provides a concentrate comprising a salt of a phenoxy acid herbicide, together with an alkanoate (particularly the octanoate) of ioxynil or bromoxynil. It is clear, however, from the disclosure of this reference that it is considered to be very surprising that the particular ioxynil and bromoxynil esters are compatible with the phenoxy acid salts, and indeed it is found that most herbicidal esters are not compatible with phenoxy acid salts in such a manner.
Detailed investigations subsequent to the date of U.S. Pat. No. 4,637,830 have indicated that the commonly established esters of herbicides such as fluroxypyr, and haloxyfop are not compatible with herbicidal acid salts, in that it is not possible to formulate the two herbicides together in a single phase aqueous composition.
WO-94/24866 is concerned with the preparation of herbicidal compositions which are emulsifiable concentrates, concentrated aqueous emulsions, wettable powders, or dispersable granules containing fluroxypyr derivatives. The fluroxypyr is present in the form of an ester which is a liquid at 25.degree. C. Various other herbicides may also be present, in order to produce combination products, and phenoxy acids and their esters are mentioned. There is no mention however of salts of herbicidal acids, nor any suggestion that it might be possible to provide combination products of fluroxypyr esters which are aqueous solutions, rather than emulsions or emulsifiable (i.e., non-aqueous) concentrates.
We have now determined that a number of other herbicidal esters which are not structurally similar to ioxynil and bromoxynil alkanoates will dissolve in salts of acid herbicides, in particular salts of phenoxy acid herbicides, to provide storage stable single phase compositions. The esters in question surprisingly have in common the feature that they are liquids rather than solids, at 25.degree. C. Because the herbicidal esters in question are not structurally similar to ioxynil and bromoxynil octanoate, it would not have been predicted from U.S. Pat. No. 4,637,830 that the use of these particular herbicidal esters would result in stable aqueous compositions.
Accordingly, in a first aspect of the invention, there is provided a herbicidal composition, which is a stable, homogeneous aqueous concentrate comprising a herbicidal salt, and a water-insoluble herbicide, wherein the herbicidal salt is a sodium, potassium, ammonia, dimethylamine, diethylamine, triethylamine, monoethanolamine, diethanolamine, or triethanolamine salt of
2-(2,4-dichlorophenoxy)propionic acid (2,4-DP); ((3,5,6-trichloro-2-pyridinyl)oxy)acetic acid (triclopyr) triclopyr, which is a liquid at 25.degree. C.
The herbicidal salt used in the concentrate of the present invention may have as its anion any of ((3,5,6-trichloro-2-pyridinyl)oxy)acetic acid (triclopyr)
The counter-ion may be sodium, potassium, ammonia, dimethylamine, diethylamine, monoethanolamine, triethylamine, diethanolamine, or triethanolam
REFERENCES:
patent: 4637830 (1987-01-01), Dyer et al.
patent: 5152823 (1992-10-01), Albrecht et al.
patent: 5374603 (1994-12-01), Mulqueen et al.
patent: 5834006 (1998-11-01), Smith et al.
Dow AgroSciences LLC
Pak John
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