| 摘要 |
PURPOSE: Provided are a reactive urethane acrylate derivative having an ultraviolet absorbent, which is excellent in weather resistance and friendly to environment, a preparation thereof, and a photocurable resin composition containing the reactive urethane acrylate derivative. CONSTITUTION: The reactive urethane acrylate derivative(formula 1) is produced by a process comprising the steps of: injecting 0.005-1mol of trifunctional isocyanate into an organic solvent and keeping temperature 25-90deg.C; adding 0.005-0.2mol of the ultraviolet absorbent for 30 minutes to 4 hours in the presence of a tin-based catalyst; reacting the mixture at 40-100deg.C for 30 minutes to 5 hours; adding 0.005-0.3mol of an acrylate containing a hydroxy group and reacting it for 1-8 hours. The photocurable resin composition contains 30-70wt% of an acryl-based prepolymer having at least one acryl group, 20-60wt% of a monofunctional or multifunctional acryl-based monomer or vinyl ether-based monomer, 2-7wt% of a photo-initiator, and 0.1-10wt% of the reactive urethane acrylate derivative(formula 1). In the formula, Acryl is a monofunctional or multifunctional acrylate group, R is a compound induced from bifunctional isocyanate or trifunctional isocyanate, R2 is benzophenone or triazole, m is an integer of 1-2, and p is an integer of 1-2.
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