The present invention relates to a polyester consisting of (A) repeating units derived from an acid component which consists of (a1) 2,5-furandicarboxylic acid, (a2) an aliphatic C4-C36 dicarboxylic acid or a mixture of a plurality of aliphatic C4-C36 dicarboxylic acids, and (a3) a dicarboxylic acid containing sulphonate groups, and of (B) repeating units derived from a diol/amine component, and optionally of further repeating units (C) and/or branching agents (E), and of (D) repeating units derived from at least one di- or oligofunctional compound selected from the group consisting of a di- or oligoisocyanate and a di- or oligoisocyanurate. The present invention also relates to the production of said polyesters and the use thereof.
