the invention relates to polyesters containing at least one partly acylated polyhydroxylated compound belonging the group consisting of glycerol polycarbonates , specific polyglycerols , oxyethylene / ethylene carbonate ] copolymers , oxyethylene / ethylene carbonate ] copolymers , and oxyethylene / oxyethylene ] copolymers . the invention also relates to methods for acylating , at least partly , the polyhydroxylated compounds . the polyesters of this invention are applicable to the technical fields relating to engine and industrial lubricants , greases , hydraulic fluids , metal deformation and processing lubricants , stripping and mold dressing products , oil prospecting , mines , tunnel borers , cosmetics , detergency , inks , textile coatings and papers , to the field of food products , to the protection of wood as synthesis intermediates .