Fuente: WIPO "olive oil" Polyglycerol esters of natural oils fatty acids, which can be from a large variety of sources, e.g., olives, and of castor seed, which can be, e.g., polyricinoleic acid, which have water-in-oil emulsifier properties, processes of preparing the above compounds having water-in-oil emulsifier properties and the use of these polyglycerol esters as water-in-oil emulsifiers and/or dispersing agents for cosmetic, skin care and pharmaceutical formulations.