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The use of aqueous dispersions for radiation-curing coatings has increased within the last 20 years. A technology that began with aqueous emulsions based on unsaturated polyesters, polyester or epoxy acrylates, has advanced with new, physically drying and weather resistant, radiation-curable polyurethane dispersion systems. Compared to radiation curing 100% systems, waterbased products enable a wide variety of application techniques to be employed. Even those requiring low viscosity, such as spraying, are possible without the use of monomers or organic solvents. This advantages together with the overcome of the classical disadvantages of waterbased UV coatings and the major advances in the equipment development for 3D applications and curing of weather resistant coatings have opened up new application fields. As with non-aqueous systems, the properties of aqueous formulations can be varied widely, from hard coatings to highly flexible ones, matching the performance requirements needed for the desired application.
