Process for preparing a uv filter dispersion for wet milling

Abstract

A process for producing an aqueous dispersion of a water-insoluble, solid organic UV filter compound, comprising the steps of providing water, a dispersant, and a powder comprising the water insoluble, solid organic UV filter compound; providing an aqueous dispersant solution by adding the dispersant to the water in an amount of 0.001 to 0.25 wt.-% with respect to the total weight of the aqueous dispersant solution leaving a remaining amount of the dispersant; dispersing, using an inline disperser, the powder comprising the water insoluble, solid organic UV filter compound in the aqueous dispersant solution yielding a first aqueous dispersion; adding the remaining amount of the dispersant to the first aqueous dispersion yielding a second aqueous dispersion; further dispersing the second aqueous dispersion yielding the aqueous dispersion of a water-insoluble, solid organic UV filter compound, wherein the total amount of dispersant is higher than 0.25 wt.-% with respect to the total weight of the aqueous dispersant solution.

Dependencies are inferred from the claim text.