PRODUIT CHIMIQUE POUR L'AGRICULTURE, MICROENCAPSULE ET SA PREPARATION

摘要

A microencapsulated agricultural chemical comprises an agricultural chemical as an active ingredient having a solubility of not more than 1 g in 100 ml of water at 20 DEG C. and vapor pressure of not more than 760 mmHg at 60 DEG C. and a microcapsule wall enclosing the agricultural chemical therein and the microcapsule wall comprises a water-soluble cationic urea resin and at least one of prepolymer composed of formaldehyde and at least one compound selected from the group consisting of urea, melamine and thiourea. The microcapsule is prepared by dispersing the agricultural chemical in an aqueous medium containing the water-soluble cationic urea resin, an anionic surfactant and at least one of the prepolymer and maintaining pH of the obtained dispersion within an acidic range to polycondense the water-soluble cationic urea resin and at least one of the prepolymers.