Plant protecting and regulating compositions – Plant growth regulating compositions – Organic active compound containing
Reexamination Certificate
2001-08-24
2003-12-23
Clardy, S. Mark (Department: 1616)
Plant protecting and regulating compositions
Plant growth regulating compositions
Organic active compound containing
C504S360000, C504S362000, C504S367000, C514S407000, C514S778000, C514S937000, C514S950000, C514S970000
Reexamination Certificate
active
06667277
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to water dispersible, stable, solid products or formulations of selected starches, active agricultural agents, and surfactants and/or adjuvants. These solid products are readily water soluble or dispersible. Furthermore, these products have a starch matrix or carrier structure which changes the physical form of the product, makes it compatible when dispersed, allows for a high loading of active material and permits use of a broad range of surfactants, adjuvants and other ingredients. Furthermore and surprisingly, it has been found that such starch containing agrochemical products can exhibit increased biological efficacy of the active material.
Various formulations of agricultural active ingredients have been developed to satisfy the needs for agricultural crop protection and other related areas. Oftentimes these products have been in the form of liquid formulations.
Recently, in crop protection formulation technology there has been a desire to move away from liquid formulations to solid products such as dry granules or powders. Such solid products would reduce the use of solvents, be more environmentally friendly and reduce transportation costs. However, the ability to provide solid products using a combination of active ingredients such as glyphosate, and surfactants such as polyoxyethylene sorbitan esters, e.g. Tween 20, has been difficult because such materials are not compatible and are not easy to process or work with. Although much effort has been made to develop solid agricultural products, most of the useful solid, starch based products exhibit extended or delayed release characteristics.
U.S. Pat. No. 6,228,807 issued on May 8, 2001 to M. Kuchikata et al, discloses dry, water-soluble herbicidal compositions of glyphosate with selected surfactants. While such compositions are water dispersible, it is difficult to form compatible solutions since many surfactants are not compatible with glyphosate in concentrated form.
Despite the various disclosures of active agricultural products, including the recent '807 patent noted above, and solid products showing extended release properties, there is still the need for solid agricultural type products which are water dispersible, compatible when dispersed and exhibit quick release characteristics.
Accordingly, what is desired for use in agricultural applications, is a stable, solid product which has quick release properties, provides high load of active materials and can combine multiple components into a compatible system.
SUMMARY OF THE INVENTION
Now it has been found that stable, water dispersible solid products of agricultural active agents are provided when combined with selected starches and optionally surfactants and/or adjuvants.
More particularly, this invention is directed to a stable, dry solid formulation which is water dispersible and provides a rapid, compatible, homogeneous dispersion and comprises:
a) a chemically modified starch,
b) a biologically active agricultural material, and optionally
c) a surfactant and/or adjuvant.
This invention further involves agrochemical formulations containing combinations of two or more active materials.
DETAILED DESCRIPTION OF THE INVENTION
This invention involves stable, water dispersible solid products of selected starches, agricultural active agents, and surfactants and/or adjuvants. These dry solid products or formulations are rapidly dispersed in aqueous medium, compatible when dispersed and provide quick release of the bioactive agent. These formulations also provide a high loading of the active ingredient and have been found especially useful in agricultural crop protection. Furthermore, the solid product of this invention has a starch matrix which allows for the use of one or more different active materials and the use of a wide variety of surfactants, adjuvants and other ingredients while still providing a compatible dispersion and high load capacity.
Stable, solid products are those where there is no bleeding or separation of individual components. Generally a product is considered stable when this condition exists for at least six months.
Dispersible, solid products are those which are functionally uniform or homogeneous when dispersed. The dispersed or water solubilized product may be in the form of a solution, emulsion or suspension.
Compatible solutions are those where the individual components remain homogeneous in the final aqueous solution. Compatible emulsions in water are those that remain stable, do not coalesce, phase out or separate, flocculate, aggregate or produce sediment. For compatible suspensions in water, the solids remain homogeneously suspended in the end use dispersion, i.e. they do not drop out. The compatible solutions or dispersions provide relatively or functionally uniform distributions of the components in the end use liquid. Compositions are typically considered compatible when these conditions exist for at least 4 hours and more particularly 24 hours or more.
Rapidly or readily dispersible is defined as a mixture with cold water and minimal agitation that gives a dispersion in less then 10 minutes, more particularly less then 3 minutes.
Solid products are those such as the type having a particulate form or structure and having a wide range of sizes and shapes, such as powders, granules (dust free powders), flakes, chips, sheets, tablets, pellets, agglomerates, etc.
The solid product or formulation of this invention will comprise either the combination of starch, active material and surfactant and/or adjuvant; starch and active material; or starch and surfactant and/or adjuvant. Any of the above formulations may also include optional additive ingredients.
The active ingredients used in the system or formulations of this invention include a broad range of materials and this includes active ingredients some of which don't form free standing powders on their own. Some of the useful active materials may be liquid while others may be solids with low or high melting points. Particularly useful active ingredients for this invention are liquids at room temperature or low melting (e.g. <80° C.) materials and high melting (e.g. >80° C.) crystalline materials.
The agricultural active agents which are used in the formulations of this invention can be any one or more of a wide range of water dispersible agrochemically active materials. Description of the actives as water dispersible means that they are water soluble or can be suspended or emulsified in water. More particularly, it may be one or more herbicides, pesticides, for example insecticides, fungicides, acaricides, nematocides, miticides, rodenticides, bactericides, mollusicides and bird repellants, and/or plant growth regulators. Especially useful active materials are herbicides, insecticides and fungicides. Usually, the active material will be a water insoluble or immiscible material, although granules can be made including water soluble active materials. Specific examples of active materials include:
Herbicides such as 6-chloro-N-ethyl-N-(1-methylethyl)-1,3,5-triazine-2,4-diamine (common name atrazine); N,N′-bis(1-methylethyl)-6-(methylthio)-1,3,5-triazine-2,4-diamine (common name prometryn); substituted ureas such as diuron or N′-(3,4-dichlorophenyl)-N,N-dimethylurea); sulfonyl ureas such as metsulfuron-methyl{2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl) amino]carbonyl]amino]sulfonyl]benzoate}; triasulfuron {2-(2-chloroethoxy)-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide}; tribenuron-methyl {methyl 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2yl)-methylamino]carbonyl]amino]sulfonyl]benzoate} and chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl] benzenesulfonamide}; bis-carbamates such as phenmedipham or {3-[(methoxycarbonyl)amino] phenyl (3-methylphenyl)carbamate}, aryloxyalkanoic
Auda Mahroussa I.
Eden James L.
Hartmann Frank D. J.
Rommens Johan C. G.
Solarek Daniel B.
Clardy S. Mark
Kaiser Karen G.
National Starch and Chemical Investment Holding Corporation
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