The invention relates to a radiation-curable binder composition for powder paint formulations. The binder composition comprises: a) a solid polymer with an amount of unsaturation of between 300 and 1800 g per mole of unsaturated group (WPU) and with a molecular weight (Mn) of between 800 and 5000 g per mole and b) a cross-linker comprising units of a prepolymer having a molecular weight (Mn) higher than 400 and units of a vinyl ether or an unsturated alcohol, the number of polymerizable unsaturations of the cross-linker being higher than or equal to 2.
