MICROENCAPSULATED HERBICIDAL COMPOSITION ADAPTED TO CONTROLLED RELEASE OF ACTIVE PRINCIPLE Russian patent published in 1998 - IPC

FIELD: agriculture; chemical preparation for plant protection. SUBSTANCE: composition comprises acetochlorine, as active principle, and antidote compatible with the latter. Composition is contained in microcapsules produced by dispersing at room temperature, active principle and mixture of polymethylene polyphenyl isocyanate and isomeric 2,4- and 2,6-tolylene diisocyanates taken in ratio 1.5-2:1. Dispersing is carried out in aqueous phase containing 1.0-1.5 wt.-% of protective colloid, preferably, alkali metal lignosulphonate and 0.3-1.0 wt.-% of surfactant, followed by heating mixture up to 40-90 C and by cooling it down to room temperature. Microcapsules are less phytotoxic than conventional emulsion concentrate to maize while displaying the same activity to sorghum. EFFECT: higher efficiency. 4 cl, 5 tbl