New oligomeric polyesters compositions and use as surfactants

Compositions of polyester oligomers possessing surfactant properties of average molecular weight less than 5000 g / mol, an acid number of greater than 10 mg NaOH / g, which comprises several polyester oligomers and a compound selected from: glycerol, succinic acid, a monoester of succinic acid, an alcohol, a glycoside.