Radiation-polymerizable composition and printing inks containing same

A method for forming a coating on a substrate, comprising:

• a) providing a radiation-polymerizable composition which contains the product of combining at least one radiation curable acrylate resin oligomer prepared by reacting an alkoxylated polyol with a first acid component which includes an ethylenically unsaturated carboxylic acid or reactive derivative thereof, and a polycarboxylic acid or reactive derivative thereof, and a rheology modifying oligomer copolymerizable with the radiation curable acrylate resin oligomer when subjected to radiation-polymerization conditions, the rheology modifying oligomer being obtained by reacting a diepoxide with a second acid component which includes an ethylenically unsaturated carboxylic acid or reactive derivative thereof in the presence of a polyamide derived from a polymerized fatty acid;
• b) applying said composition to a substrate;
• and
• c) exposing said composition to a source of radiation to effect polymerization thereof.