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OwnerFui-Tseng H. Lee, Paul Nicholson +2inventors
InventorsFui-Tseng H. Lee, Paul Nicholson, Janos Szamosi, William T. Sommer
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Pesticidal formulations of cadusafos are provided. An aqueous capsule suspension is provided, containing from about 150 to about 360 grams of cadusafos per liter of formulation and having lower mammalian toxicity than aqueous cadusafos microemulsion formulations is prepared by interfacial polymerization of a first polyfunctional compound, such as a polymethylene polyphenyl isocyanate, with a second polyfunctional compound, such as a polyfunctional amine or mixtures of polyfunctional amines, in an aqueous phase optionally containing from about 0.05 to about 0.50 xanthan gum viscosity modifier/stabilizer. A granular form of the microencapsulated cadusafos is also provided. Several such formulations and the method of their preparation are described.
A pestidical formulation prepared according to a process comprising the steps of:
A pesticidal formulation prepared according to a process comprising the steps of:
A pesticidal formulation of cadusafos comprising an aqueous suspension of microcapsules, the microcapsules comprising a polyurea shell surrounding a core of the cadusafos, the polyurea shell having been formed from interfacial polymerization of an isocyanate and one or more polyfunctional amines, the polyurea shell being sufficiently impermeable to the cadusafos so as to effect a reduction in mammalian toxicity of the formulation as compared with aqueous microemulsion formulations having an equivalent or lesser cadusafos concentration.
A pesticidal formulation of from about 150 to about 360 grams cadusafos per liter of formulation, about 0.7 to about 2.5 weight percent polyvinyl alcohol and about 0.3 to about 0.9 weight percent of an antifoam agent, the formulation comprising an aqueous suspension of microcapsules, the microcapsules comprising a polyurea shell surrounding a core of the cadusafos, the polyurea shell having been formed from interfacial polymerization polymethylene polyphenyl isocyanate and one or more polyfunctional amines, wherein the weight percent of cadusafos is about 53 to about 92 percent of a water-immiscible phase provided for the interfacial polymerization, the weight percent of the polymethylene polyphenyl isocyanate is about 4 to about 25 percent of the water-immiscible phase, the polyfunctional amine is selected from the group consisting of diethylenetriamine, triethylenetetramine, 1,6-hexanediamine, and a combination of one or more of diethylenetriamine, triethylenetetramine, and 1,6-hexanediamine, the weight percent of the polyvinyl alcohol and antifoam agent are based on the total composition of the formulation with water included, and said formulation has reduced mammalian toxicity as compared with known aqueous microemulsion cadusafos formulations of an equivalent or lesser cadusafos concentration.
A pestidical formulation of cadusafos, comprising carrier particles coated with an aqueous pesticidal formulation of from about 150 to about 360 grams cadusafos per liter of aqueous formulation, about 0.7 to about 2.5 weight percent polyvinyl alcohol and about 0.3 to about 0.9 weight percent of an antifoam agent, the aqueous formulation comprising an aqueous suspension of microcapsules, the microcapsules comprising a polyurea shell surrounding a core of the cadusafos, the polyurea shell having been formed from interfacial polymerization of polymethylene polyphenyl isocyanate and one or more polyfunctional amines, wherein the weight percent of cadusafos is about 53 to about 92 percent of a water-immiscible phase provided for the interfacial polymerization, the weight percent of the polymethylene polyphenyl isocyanate is about 4 to about 25 percent of the water-immiscible phase, the polyfunctional amine is selected from the group consisting of diethylenetriamine, triethylenetetramine, 1,6-hexanediamine, and a combination of one or more of diethylenetriamine, triethylenetetramine, and 1,6-hexanediamine, the weight percent of the polyvinyl alcohol and antifoam agent are based on the total composition of the aqueous formulation with water included, and said aqueous formulation has reduced mammalian toxicity as compared with known aqueous microemulsion cadusafos formulations of an equivalent or lesser cadusafos concentration.
Dependencies are inferred from the claim text.