Patent ID: 7008638

Claim:
A method of preparing a cosmetic formulation of a lipophilic cosmetic active agent in the form of an aqueous nanodispersion, which steps consist essentially of (α) mixing the components (a) 0.1 to 30% by weight of a phospholipid, (b) 1 to 50% by weight of a polyoxyethylene coemulsifier selected from the group consisting of polyethoxylated fatty alcohols, polyethoxylated fatty acids, polyethoxylated vitamin E derivatives, polyethoxylated lanolin and derivatives thereof, polyethoxylated fatty acid partial glycerides, polyethoxylated alkylphenols, polyethoxylated fatty alcohols and salts thereof, polyethoxylated fatty amines and fatty acid amides and polyethoxylated carbohydrates, (c) 0.1 to 80% by weight of a lipophilic component which is a natural or synthetic or a partially synthetic C 4 -C 18 triglyceride and a lipophilic cosmetically active agent, in which any cosmetically active agent is lipophilic and is always present in component (c), and (d) 7.40 to 14.2% by weight of ethanol, with conventional stirring apparatus until a homogeneous clear liquid is obtained, and (β) adding the liquid obtained in step (α) to a water phase, wherein step (β) is carried out in the absence of high shear or cavitation forces, and wherein the particles in the nanodispersion have an average diameter of <50 nm.