| abstract |
PURPOSE: An agricultural, insecticidal and acaricidal composition, obtained by encapsulating a pyrethroid based insecticide and acaricide in polyurea based films to form microcapsules, capable of exhibiting improved residual efficacy and having reduced toxicity to fishes. n CONSTITUTION: Microcapsules, obtained by suspending a hydrophobic solution containing a polyfunctional isocyanate, e.g. toluene diisocyanate, and pyrethroid based insecticide and acaricide, e.g. fenvalerate, etc., in an aqueous solution containing a water-soluble high polymer, e.g. polyvinyl alcohol, etc., as a suspending and dispersing agent in a state of driplets, directly heating the suspension to carry out reaction with water, etc., initiating polymerization reaction, carrying out encapsulating reaction, directly diluting the resultant encapsulated dispersion with pure water to give a given parent chemical concentration, as necessary, adding a dispersion stabilizer and having ≤80×m average particle size, ≤0.3μm film thickness and ≥250 ratio of the average particle diameter of the film thickness. n COPYRIGHT: (C)1987,JPO&Japio |