Radiation curable oligomers based on tris(2-hydroxyethyl) isocyanurate

摘要

A radiation curable oligomer which cures to provide a combination of improved elongation and tensile strength is constituted by a selected hydroxy functional polyester having its active hydrogen atoms end-capped by reaction with ethylenically unsaturated monoisocyanate. This polyester is the reaction product of one mole of tris (2-hydroxyethyl) isocyanurate with three moles of saturated dicarboxylic acid and three moles of diol, these proportions being variable within the limits of +/-20%, the polyester reaction product having an acid value of less than 20, preferably less than 5, and providing hydroxyl-terminated branches having an average length corresponding to a calculated molecular weight of 100-1500.