Patent ID: 7288575

Claim:
A process for the preparation of an oil-in-water emulsion whose organic phase has a viscosity of greater than or equal to 1 Pa.s at 25° C., comprising the step of mixing together with stirring: the organic phase, and an aqueous phase comprising at least one heat-induced thickening polymer displaying a thickening temperature and a jump in viscosity between 25 and 80° C. such that: said jump in viscosity has a ratio log 10 (viscosity at 80° C.)/log 10 (viscosity at 25° C.) of at least equal to 1, and said jump in viscosity has a variation in viscosity being reversible; the amount of heat-induced thickening polymer being such that the aqueous phase has a viscosity of from 0.2 to 5 times that of the organic phase, said emulsion being prepared at a preparation temperature greater than or equal to the thickening temperature of the heat-induced thickening polymer.