Abstract: This invention relates to a process for producing crosslinked elastomeric shaped polyurethane structures from crosslinked polyurethanes dissolved in solvents produced by the combination of the following steps:1. preparation of an NCO pre-adduct in a non-critical NCO/OH proportion from a treated polyol and the corresponding diisocyanate in a highly polar solvent;2. preparation of a solution containing crosslinked polyurethanes by introducing into the polymerization vessel a chain propagating and/or chain crosslinking agent and/or a combination thereof, and stirring into said vessel the NCO pre-adduct solution from step 1 such that the viscosity becomes an indication of the degree of the instantaneously occurring chain propagation and chain crosslinking reactions. In this way a solution is obtained which is at the borderline state between solution and gel and in which highly crosslinked polymer portions are uniformly distributed;3. molding;4. removal of the solvent by evaporation.