Plant protecting and regulating compositions – Plant growth regulating compositions – Organic active compound containing
Patent
1995-09-08
1998-08-18
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Organic active compound containing
A01N 5702
Patent
active
057958475
DESCRIPTION:
BRIEF SUMMARY
This application has been filed under 35 USC 371 as the national stage of PCT/DK94/00099, filed Mar. 8, 1994.
The present invention relates to concentrated herbicide preparations comprising at least one herbicide being fine-grained and suspended in an aqueous electrolyte solution, said herbicide comprising at least one primary, secondary or tertiary amino group and at least one carboxylic acid group and at least one phosphor containing acid group, a process for producing it and an activating, concentrated additive for application in combination with said herbicides.
BACKGROUND OF THE INVENTION
It is customary to produce herbicide preparations as suspensions in water. But normally the content of electrolytes in the aqueous phase is low, since a high content of electrolytes in water has a tendency to lower the solubility of the additives being necessary to stabilize the herbicide suspension. Amongst these additives, the surfactants are particularly important, said surfactants being necessary to ensure the wetting in connection with the grinding of the suspended herbicide, and being often desirable in connection with the intrusion of the herbicides in the weeds. Often only a few surfactants are suitable to ensure, in an appropriately broad temperature interval from -10.degree. C. to approximately 50.degree. C., that the suspension is effectively wetted and also flows satisfactorily. Additionally the suspensions almost always contain soluble, viscosity regulating compounds, ensuring that the viscosity in a broad temperature interval does not fall below a certain low value in order to avoid precipitation of the suspended herbicide. A too high content of electrolytes in the aqueous phase might lead to the gelatination or precipitation of the viscosity regulating compounds. The surfactants as well as the viscosity regulating compounds and eventually a certain amount of a dissolved glycol component can ensure, that the suspension after freezing and subsequent unfreezing thaws out again as a flowable, not gritty suspension.
DESCRIPTION OF PRIOR ART
In published european patent application EP 388.239 A1 pesticide suspensions are described, in which a certain amount of electrolytes is desirable. The suspension of finely ground pesticides in a concentration from 10-70% by weight in aqueous, structured systems of surfactants is described. The following pesticides are mentioned explicitly: ethofumesate, phenmedipham, dazomet, mancozeb, methylene bisthiocyanate, amitraz and triforine. None of these pesticides contains both an acid and an amino group. The wording "structured systems of surfactants" is intended to mean aqueous systems, in which the surfactants form mesophases comprising structures larger than conventional spherical micelles and mutually interacting to form thixotropy in the aqueous medium. The structure comprises multilayers of spherulites or lamellae dispersed or emulsified as rods or discs in an outer aqueous phase, the size being normally 0.5-20 .mu.m. In the 14 examples of the application the not surface active electrolytes are present in an amount of 1.2-6.4% by weight of the total composition. It is a characteristic feature of this system, that the surfactant and the electrolyte must be adapted to each other as regards composition and amount to obtain the desired, stable structure.
Hungarian patent HU 200076 discloses, how the sedimentation tendency of aqueous suspensions may be avoided by addition of electrolytes to the suspensions. According to the patent lumps of surfactant will be formed when an electrolyte is added, causing the liquid to be turbid as the stabilisation takes place. It is not clearly evident from the patent whether the stabilisation is caused by crystallisation of surfactant on the surface of the suspended pesticide or by crystallisation of surfactant as a new phase (compare EP 388.239), or by the viscoelasticity caused by the precipitation. The improved stability is evaluated by centrifugation through indication of the not sedimented part. Only one of the samples (table 7)
REFERENCES:
patent: 5258358 (1993-11-01), Kocur et al.
patent: 5258359 (1993-11-01), Kassebaum et al.
patent: 5356861 (1994-10-01), Gednalski et al.
STN International, Chemical Abstracts, vol. 119, No. 9, 88928t "Herbicidal glyphosate salt concentrate", Aug. 30, 1993.
Nielsen Erik
Oxb.o slashed.l Arne
Clardy S. Mark
KVK Agro A/S
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