Radiation-curable coating composition, method for producing scratch-resistant coatings, use of the coating composition, and substrate coated with a coating composition

A radiation-curable coating composition, comprising:

• i) 45.0 to 59.0 wt % of a urethane acrylate prepared from an isocyanurate trimer of 1,6-hexamethylene diisocyanate and butanediol monoacrylate, wherein the isocyanurate trimer has an NCO content in a range of 19.6 to 24.0 wt % and an equivalent weight of 175 to 214, and the urethane acrylate has a weight ratio of the isocyanurate trimer to the butanediol monoacrylate in a range of 1.0:0.65 to 1.0:0.9;
• ii) 25.0 to 37.0 wt % of a tetrafunctional polyester acrylate monomer;
• iii) 8.0 to 12.0 wt % of a component A selected from the group consisting of a diol diacrylate ester, a monoacrylate ester, and mixtures thereof;
• iv) 2.3 to 3.5 wt % of a photoinitiator;
• v) 2.1 to 3.1 wt % of a reactive acryloyltriazole UV absorber;
• vi) 1.5 to 2.0 wt % of a nonreactive UV absorber;
• vii) 0.7 to 1.0 wt % of a sterically hindered amine;
• viii) 0.4 to 0.9 wt % of a flow control additive;
• where the weight percentage ranges are based on a sum of the solid content of components i) to viii), their sum making 100 wt %.