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Radiation curable coatings based on urethane acrylates offer a broad spectrum of performance providing a range from highly elastic to very hard coatings with high toughness and abrasion
resistance. Furthermore, aliphatic urethane acrylates show good weather resistance. However, the
application of urethane acrylates is limited due to relatively high viscosity resulting from hydrogen
bridge bonding between functional urethane groups which is on the other hand responsible for
superior mechanical properties. The viscosity of a given formulation can be adjusted by adding solvent or reactive thinner which influence the crosslinking density of the coating. New low viscous urethane acrylates based on a novel type of isocyanate containing acrylate functionality via allophanate are presented. Potential outdoor applications in automotive coatings providing highly scratch resistant clear coats are discussed.