Plant protecting and regulating compositions – Plant growth regulating compositions – Plural active ingredients
Patent
1990-12-31
1993-01-19
Elmore, Carolyn
Plant protecting and regulating compositions
Plant growth regulating compositions
Plural active ingredients
71DIG1, 504143, 504139, 504129, A01N 4334, A01N 4354, A01N 3700, A01N 2522
Patent
active
051804166
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a complex suspended herbicide formulation without an organic solvent which is useful for controlling agriculturally hazardous weeds.
BACKGROUND OF THE INVENTION
As thiolcarbamate herbicides, commercial products are available such as those known by common names Thiobencarb, Orbencarb, Esprocarb, Molinate, EPTC, and the like, and they are very useful for controlling gramineous weeds which are strongly hazardous weeds. In addition, it has been known that a complex formulation, comprising a thiolcarbamate herbicide and an active ingredient for controlling broadleaf weeds, galingale weeds or the like, is a labor saving herbicide which exhibits a wide spectrum for controlling weeds.
These formulations including thiolcarbamate herbicides are used mainly in the form of granules for direct application and in the form of emulsifiable concentrates to be diluted for use.
Conventional emulsifiable concentrates are prepared usually by employing an organic solvent and a surfactant with an active ingredient. In general, a herbicidally active ingredient of thiolcarbamate type has a low melting point and most of the herbicidally active ingredients are liquid at common temperature. In addition, another herbicidally active ingredient to be mixed with that of thiolcarbamate type may be equivalent to various ingredients such as a liquid ingredient being compatible with that of thiolcarbamate type and a solid ingredient being slightly soluble therein. In the case where said another ingredient is slightly soluble in the herbicidally active ingredient of thiolcarbamate type, an organic solvent has to be blended thereinto. However, use of an organic solvent brings about various problems including a safety problem to the users of the agricultural chemical because of the phytotoxicity of the organic solvent, a storage problem due to the inflammability of the organic solvent, an environmental pollution problem by its application, a phytotoxicity to crop plants, and the like. Furthermore, in order to emulsify and disperse not only the active ingredient but also the organic solvent used, a surfactant is employed in a large amount, whereby there will be an economical problem as well as a problem of environmental pollution due to the surfactant.
Therefore, for an emulsifiable concentrate, it is desired to essentially solve the above-mentioned various problems attributable to the organic solvent and the surfactant.
A wettable powder and a flowable formulation are conceivable as the types of formulation which may be substituted for the emulsifiable concentrate. However, the wettable powder has a problem of dusting at the time of dilution, and there is a possible danger to the safety of the users. Besides, in the case of a liquid activate ingredient, it is difficult to obtain a highly concentrated formulation as compared with the emulsifiable concentrate. A granulated wettable powder has also been proposed to prevent dusting at the time of dilution, but in the case where the active ingredient is liquid, such a method still has a drawback, that it is difficult to obtain a formulation having a high concentration. On the other hand, a flowable formulation, prepared by having a solid active ingredient suspended and dispersed in water or having a liquid active ingredient emulsified and dispersed in water, usually contains an organic solvent such as ethylene glycol, propylene glycol, or the like in order to impart freeze resistance. Accordingly, it has a problem attributable to such an organic solvent. In addition, it has a problem that the freeze resistance is inadequate in an extremely cold area of -20.degree. C. or lower, whereby it freezes, and when returned to common temperature, the dispersion system will be destroyed, and separation or precipitation will result. Furthermore, in many cases, a flowable formulation is adjusted to have a high viscosity to improve the storage stability at common temperature, whereby the handling at the time of use often tends to be difficult.
As a conve
REFERENCES:
patent: 4599104 (1986-07-01), Nagano et al.
patent: 4921527 (1990-05-01), Tseng
Katou Susumu
Nakamura Kanji
Clardy S. Mark
Elmore Carolyn
Kumiai Chemical Industry Co. Ltd.
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