Patent ID: 9622473
Date: 2017-04-18
CPC Classifications: A01N

Claim:
1. A method for preparing a herbicidal composition, the method comprising the steps of: providing a water immiscible phase comprising fluoroxypyr and an isocyanate dissolved in a rosin solvent system comprising methyl ester of hydrogenated rosin, the weight ratio of the fluoroxypyr to the rosin solvent being from 1:10 to 10:1; providing an aqueous phase comprising one or more surfactants; combining the water immiscible phase and the aqueous phase to form a dispersion of the water immiscible phase in the aqueous phase; adding to the resulting dispersion an amine, thereby forming microcapsules of polyurea, the polyurea being formed from polymethylene polyphenol isocyanate, and the microcapsules containing droplets of the water immiscible phase, wherein the fluoroxypyr is present in an amount of 50% by weight of the microcapsules, the polymer is present in an of amount 3.5% by weight of the microcapsules, and the methyl ester of hydrogenated rosin is present in an amount of 20% by weight of the microcapsules; and curing the microcapsules, wherein the microcapsules have a suspensibility of greater than 90%, a dispersibility of greater than 90%, and a wet sieve residue of less than 0.1%.