Abstract: 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.

Abstract: A composite molded baseball bat is provided using a tubular, high yield strength aluminum core surrounded by a foam plastic body having a density of from 30-50 pounds per cubic foot and an integral outer skin. The tubular aluminum core has an outside diameter of from three-quarters to 1 inch and a wall thickness of from 0.062 to 0.125 inch.