Radiation curable aqueous compositions with controlled polymer flow

An aqueous radiation curable composition containing at least one ethylenically unsaturated polyurethane (A) and at least one ethylenically unsaturated polyurethane (B), different from the polyurethane (A), said ethylenically unsaturated polyurethane (B) preferably being characterized by a molecular weight that is below 10,000 Daltons; and optionally, at least one ethylenically unsaturated compound (C) different from (A) and (B); wherein the radiation curable composition in dry form has a steady-state creep viscosity η30, expressed as the apparent viscosity after a deformation time of 30 minutes with a load σO=50 Pa at 23° C., that is above 1·103 Pa·s, more preferably above 1·104 Pa·s. The compositions are characterized by an improved creep viscosity η30 and provide polymer materials with a good flow and mirror effect. In general, these materials are less sensitive to dust pick-up and fingerprints. Further provided is a one-vessel solvent free process for preparing such materials.