New biodegradable polymers from renewable sources. High molecular weight poly(ester carbonate)s from succinic acid and 1,3‐propanediol

High molecular weight poly(ester carbonate)s have been prepared by a two‐step chain‐extension reaction performed on oligomeric α,ω‐dihydroxy‐terminated poly(1,3‐propylene succinate) in turn obtained by thermal polycondensation of excess 1,3‐propanediol with succinic acid. The new polymers have a biodegradable backbone and derive from renewable sources. Therefore, they have a potential as environment‐friendly materials.