A water dilutable UV-curable polyurethane containing alkylene oxide groups, the polyurethane being obtained from components comprising at least: (i) 1 to 25 wt. % of at least one polyisocyanate; (ii) 0 to 80 wt. % of at least one hydroxyl functional compound containing alkylene oxide groups; (iii) 10 to 90 wt. % of at least one hydroxyl functional compound containing at least one polymerisable unsaturated (meth)acryloyl functional group per molecule; and (iv) 0 to 50 wt. % of at least one isocyanate-reactive compound not comprised by (ii) or (iii); wherein the sum of (i) to (iv) is 100%.