Abstract: The invention is directed to polyesters comprising the following repeating unit of formula (I) wherein: R1 and R2 independently represent H or CH3, R3 and R4 independently represent H or OCH3, R5 independently represents C1-16alkyl-O(C?0)R7(C?0); C1-16alkyl(C?O); (C?O)R7(C?O); C1-16alkyl(C?O)OR7O(C?O)C1-16alkyl; C1-16alkyl(C?O)OR7 or (C?0)C2-3alkyl(C?0)OR7O(C?0)C2-3alkyl, R7 independently represents C1-20alkyl; benzene or furan, R6 represents CH2 or (C?O), n=0-3, m?10. The invention is also directed to a process for the preparation of these polyesters, wherein a monomer or monomer mixture is heated in the presence of a catalyst to a temperature of 100-300° C. under a pressure below 10 kPa.