Disclosure is made of radiation curable, solvent-less compositions useful in coatings, films and in preparing printing inks. The compositions comprise the reaction product of an equivalent excess of an acrylic type acid with a particular class of polyester polyol. The polyester polyol is the condensation product of an excess of an aliphatic polyol having at least two hydroxyl groups and a molecular weight of from 60 to 250 with a specific class of aliphatic polycarboxylic acids derived from fatty and resin acids.