MICROENCAPSULATED HERBICIDAL COMPOSITION AND METHOD FOR ITS PREPARATION Russian patent published in 1998 - IPC

FIELD: chemical preparations for plant protection. SUBSTANCE: composition contains acetochlorine, as active principle, and agriculturally acceptable, antidote. Composition is contained in microcapsules which shell is constituted by product of self-condensation of amino resin prepolymer. The latter is produced by self-condensation of formaldehyde and urea or malamine, preferably esterified by n-butanol or isobutanol. Shell material can be modified with 6-14 wt.-% of acetochlorine. Proposed composition is produced by method of residing in dispersing solution of above-described prepolymer in acetochlorine, in aqueous medium containing surfactant, followed by acidifying resulting emulsion up to pH = 0-4, while simultaneously, heating emulsion up to 50 C to complete condensation. Finally, dispersion is cooled down while its pH rises up to 7.0. EFFECT: higher efficiency. 9 cl, 2 tbl