| 摘要 |
<p>A herbicidal composition is provided, the composition comprising microcapsules containing a solution of at least one herbicidally active compound that is solid at room temperature and with a melting point below 190°C, said herbicidally active compound being other than a sulfonylurea, preferably fluroxypyr, in a polyhyrdric alcohol ester solvent system; the microcapsules being suspended in a continuous phase of a polyhydric alcohol solvent system having suspended therein finely divided particles of one or more sulfonylureas. A method for preparing the composition comprises the steps of i) providing a water-immiscible liquid phase comprising a polyhydric alcohol ester, an active compound that is solid at room temperature and with melting point below 190°C, and a first wall forming component; ii) providing an aqueous phase comprising water and, optionally, one or more surface active agents; iii) combining the water immiscible phase with the aqueous phase to form a dispersion of the water-immiscible phase in the continuous aqueous phase; iv) adding a second wall forming component to the resulting mixture, causing interfacial polymerization of the first and second wall forming components and thereby encapsulate the droplets of the water-immiscible phase; v) providing a suspension of a sulfonylurea in a polyhydric alcohol ester, optionally with one or more dispersants; and vi) combining the composition prepared in step (iv) with the composition prepared in step (v).</p> |
