). The copolyester of poly(butylene adipate)-co-(dilinoleic adipate) (PBA-DLA) with 70-30 wt% hard to soft segment ratio was synthesized via two-stage polycondensation method in bulk using CAL-B as biocatalyst. In this experiment, CAL-B (10 % of total monomers, 0.82 g), BDO (21.0 mmol, 1.89 g), DA (23.7 mmol, 4.80 g), and DLD (2.77 mmol, 1.50 g) were added to a round bottom flask and heated in an oil bath with a magnetic stirrer. The reaction was carried out under inert gas flow at atmospheric pressure and an initial temperature of 80°C. After one hour, the temperature was slowly increased to 95°C, and the collection of ethanol was monitored for three hours. Then, the reaction was conducted under a pressure of 600 Torr for 21 hours, after which the pressure was reduced to 2 Torr while maintaining the temperature at 95°C for 35 hours. At the end of the reaction, the product mixture was dissolved in acetone, filtered to remove CAL-B, and then added dropwise to cold methanol while stirring to precipitate a white polymer product. In the final step, the product was collected, washed with methanol, and dried in a vacuum at 40°C for 24 hours. The copolymer obtained through the described synthesis was designated as PBA-DLA_B.