Patent ID: 6358520
Filing Date: 2002-03-19
Classification: A01N

Abstract:
A process for the production of a water-dispersible composition containing a microencapsulated pesticide, comprising (a) preparing an organic medium comprising at least one or more liquid or solid pesticides dissolved or suspended in a solvent and one or more monomers; (b) adding said organic medium to an aqueous medium forming a dispersion of organic medium droplets in the aqueous medium; (c) causing the monomers of the organic medium to polymerize thereby forming an aqueous suspension of microcapsules which contain at least one water-insoluble pesticide enclosed within a polymeric shell and that are suspended in an aqueous medium containing one or more water-soluble polymers in which at least one of the water-soluble polymers is a copolymer or homopolymer of acrylic acid and wherein the water-soluble polymers are added during step (b) or step (c); and (d) spray-drying the aqueous suspension of step (c) to produce a water-dispersible composition comprising said microcapsules in a matrix comprising said water-soluble polymer, wherein the water-soluble polymer comprises from about 2 to about 15 weight percent of the water-dispersible composition.