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Abstract

A herbicidal 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., other than a sulfonylurea, preferably fluroxypyr, in a polyhydric alcohol ester solvent system; suspended in a continuous phase having suspended therein finely divided particles of one or more sulfonylureas. A method for preparing the composition comprising 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 encapsulating 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).

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First Claim