Patent ID: 6264965
Filing Date: 2001-07-24
Classification: A61K,A61P,A61Q

Abstract:
a method of preparing a creamy composition in the form of an oil-in-water emulsion, said composition comprising:an oily phase dispersed in an aqueous phase,at least one anionic emulsifier which is a liquid at room temperature, andat least 5% by weight, relative to the total weight of the composition, of at least one wax,wherein the oily phase is in the form of a soft paste at room temperature formed in a mixer-screw extruder,said method comprising:(a) preparing the oily phase in the form of a soft paste by mixing the waxes and oils,(b) heating the oily phase to a temperature at which it melts,(c) introducing melted oily phase and the other constituents of the oily phase into a mixer-screw extruder subjected to a temperature gradient ranging from 80.degree. C. to 20.degree. C.,(d) blending the mixture obtained while it is conveyed to the outlet of the mixer-screw extruder to produce a soft paste,(e) incorporating the emulsifier and, optionally, if present, the co-emulsifier into the soft paste obtained from (d), and(f) incorporating the mixture from (e) into the aqueous phase,to thereby obtain said composition.