Plant protecting and regulating compositions – Plant growth regulating compositions
Patent
1992-09-11
1994-12-13
Hollinden, Gary E.
Plant protecting and regulating compositions
Plant growth regulating compositions
504212, 504323, 504268, 71DIG1, 424409, A01N 2508, A01N 2530, A01N 2512
Patent
active
053729897
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In general, water-dispersible or water-soluble granular compositions are prepared by (1) processes involving aqueous (or solvent) spraying and subsequent drying such as pan or fluidized bed granulation, high intensity mixing, granulation, spray drying, or by spraying the active material (or solution thereof) upon a preformed carrier or (2) processes involving compaction such as briquetting, tabletting, and extrusion.
Japanese Patent Application No. 52/30577 discloses slow-release agrochemical-urea fertilizers which are formed from liquid or organic solvent solutions of agrochemicals, polyoxyethylene nonionic surfactants, and urea.
U.S. Pat. No. 4,707,287 is directed to the protection of certain enzymes from a peroxyacid bleach granulate and discloses an improved granulate enzyme compositions compiling core of enzyme material and a protective coating comprising an alkaline buffer salt. This patent broadly mentions the term "alkylarylethoxylates" among many others as potential waxy substances used as granulating agents, but there is no teaching of any of the specific heat-activated binders of the instant invention.
SUMMARY OF THE INVENTION
This invention comprises a low cost, rapidly water-dispersible or water-soluble pesticidal granular composition which is comprised of agglomerates consisting essentially of solid pesticidal particles bound together by solid bridges of a water-soluble heat activated binder (HAB). The granular composition contains at least about 10% voids (preferably 20% or greater) and comprises by weight based on the total weight of the composition; pesticidal particles having a size in the range of 1-50 microns or larger if the pesticide is water-soluble; in combination with or held together by solid bridges of binder (HAB) having one or more components wherein said binder meets the following five criteria: preferably 45.degree. to 100.degree. C.; 16-19; min. or less; preferably 1,000 cps or greater, and most preferred 2,000 cps or greater; and between the softening point and onset of solidification; and optionally solution) in water, is attrition resistant (non-dusty), chemically stable, and non-caking. The agglomerates or granules are 150-4000 microns and preferably 250-1500 microns in size.
DETAILED DESCRIPTION OF THE INVENTION
The most common method of applying agricultural pesticides involves their dilution in a solvent or non-solvent liquid in a mix tank followed by spraying of the resulting solution or dispersion. Because of the increasing costs of non-aqueous solvents and the toxicity of some of them, formulations involving water-soluble or water-dispersible granules have become increasingly popular. In such formulations, the dispersed particles formed on dilution should be no greater than 50 microns in their largest dimension to avoid nozzle pluggage or premature settling which results in uneven application of the pesticide. Consequently, it is necessary that all of the components of the formulated product rapidly and completely disperse or dissolve in the dilution water.
Conventional methods for the preparation of water-soluble or water-dispersible granules involve (1) solvent spraying such as fluidized bed or pan granulation techniques or the impregnation of an active pesticide agent on preformed carrier granules or (2) compaction such as tabletting or extrusion. Granules prepared by bed or pan granulation are generally sprayable upon dilution with water, while the impregnated or compacted compositions are usually applied dry and mechanically, for example, using spreaders. The solvent spraying processes can yield granules which are rapidly water-dispersible but are expensive, due to the drying step and extensive, space-consuming equipment required. The granules produced from the compaction processes are generally slow in water dispersion. Furthermore, both of these processes often require specialized technology for their operation.
Often it is desirable to use mixtures of two or more pesticides of different functions, e.g., a mixture of a herb
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Geigle William L.
Sandell Lionel S.
Wysong Robert D.
Clardy S. Mark
E. I. Du Pont de Nemours and Company
Hollinden Gary E.
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