Here we report the synthesis of news branched polyesters derived from the trans-esterification reactions at moderate temperatures (140-190°C), either from polyglycols with different molecular weights and monomers such as germylated fatty tri-esters, or from dimethyl terephtalate and germylated fatty tri-alcohol. The structure of the resulting polymers was determined by elemental analysis, FTIR, and 13C CP MAS NMR, and their thermal properties by thermogravimetry analysis and differential scanning calorimetry. 13C CP MAS NMR analysis indicates that the characteristic signals due to the methoxy groups of the germylated fatty tri-ester and the CH2OH group of germylated fatty tri-alcohol completely disappeared. This suggests that the trans-esterification process reached a nearly complete conversion. All germylated branched polyesters are insoluble in classic organic solvents due to their polydimensional structure. Thermal properties of these new materials showed that they do not present any cristallinity phase, and undergo thermal decomposition above 300°C.