Microencapsulation formulations of cadusafos

A - Human Necessities – 01 – N

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A01N 57/12 (2006.01)

Patent

CA 2338924

Pesticidal formulations of cadusafos are provided. An aqueous capsule suspension is provided, containing from about 150 to 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.

L'invention concerne des formulations pesticides de cadusafos. L'invention concerne une suspension aqueuse en capsule contenant entre 150 et 360 grammes environ de cadusafos par litre de formulation, et présentant une toxicité pour les mammifères inférieure aux formulations aqueuses de microémulsions de cadusafos. Cette suspension est préparée par une polymérisation interfaciale d'un premier composé polyfonctionnel, comme un polyméthylène polyphényle isocyanate, avec un deuxième composé polyfonctionnel, tel qu'un amine polyfonctionnel ou des mélanges d'amines polyfonctionnels dans une phase aqueuse contenant un agent modificateur/stabilisateur de la viscosité de gomme de xanthane compris entre 0,05 et 0,50. L'invention traite aussi d'une forme granulaire de cadusafos microencapsulés. L'invention a pour objet plusieurs formulations et le procédé de préparation de ces dernières.

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