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New polyesters have been prepared by solution and interfacial polycondensation of acid chlorides obtained from bis-a,v-polymethylene-[(2-methoxy)phenoxy]acetic acids, acid-ether siderophores AE n (n being the number of methylene units), and diols including bisphenol A, ethylene glycol and propanediol. For interfacial polycondensation, average molecular weights range from 1000 to 4500 g mol À1 ; at higher temperature the molecular weights increase but the yield is smaller. Differential scanning calorimetry shows T g ranging from À5 to 110°C. Polyesters are crystalline with n = 6 and amorphous with n = 2 and 4; in addition, increasing n in AE n increases molecular weights and T g values. In solution polycondensation, the average molecular weights are around 3000 g mol À1 and T g is low.