Patent ID: 6660778
Filing Date: 2003-12-09
Classification: C08J,Y10S

Abstract:
A method of grindlessly emulsifying a silicone in water, in the presence of a surfactant, at a temperature of less than 60Â° C. and under a shear of less than 100 sâˆ’1, comprising the steps of:a) preparing a primary emulsion of oil-in-water type comprising said surfactant and said silicone, under a shear of less than 100 sâˆ’1, by adding an aqueous phase to an oily phase comprising said silicone, with a proportion of oily phase in the primary emulsion being less than a maximum proportion Pmax above which addition of the aqueous phase to the oily phase does not make it possible to prepare an emulsion of oil-in-water type, and with a weight ratio of surfactant to water in the primary emulsion being such that a mixture of the water and the surfactant in this same ratio leads to an organized phase different from an inverse phase, b) enriching the primary emulsion thus prepared with an oily enrichment phase comprising the silicone, to obtain an emulsion of oil-in-water type, by mixing said primary emulsion with said oily enrichment phase under a shear of less than 100 sâˆ’1, the amount of oily enrichment phase being of less than the maximum amount above which adding said emulsion to said oily phase does not make it possible to prepare an emulsion of oil-in-water type, and c) optionally, repeating step b) once or several times, until a desired concentration of surfactant or silicone in the final emulsion is obtained, or until a desired particle size is obtained.