The present invention relates to a polyester product and its use as a polyurethane plastic prepared when starting components which can be obtained in the novel method of manufacturing multi-adduct, a method. The method, (A) an average isocyanate functional degree is 2.0 or more right inlet-dione group-containing polyisocyanate, optionally in which the use of (B) the components (A) and less than a total of 70% by weight based on the weight of (B) with , wherein (a) is different from other diisocyanates and / or poly-isocyanates, (C) the molecular weight range of 62 to 2000, and mixtures of the average functional degree is 2.0 or more polyols or polyol, and optionally (D) the component (C) It comprise reaction with monofunctional reactive compounds of-the component (D) of 40 wt% or less, other isocyanates, based on the total weight. Isocyanate groups in the reactants: an isocyanate-reactive group equivalent ratio of a 1.8: 1 to 0.6: 1 and maintained in the reaction is at least one bismuth-containing catalyst is carried out in the presence of. Polyaddition, polyurethanes, functionalized also, bismuth-containing catalyst, an isocyanate group, the equivalent ratio