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The 3M Dual Core process is a method for producing radiation cured polymer compositions via a solventless coating process. The process involves the simulations cure of two different monomer types. The first type may be either an epoxy monomer, or the polyol and polyisocyanate precursors to a urethane polymer. These are polymerized by use of an iron based organometallic photocatalyst which gives a Lewis acid upon irradiation. The second monomer type consists of acrylate monomers, which are polymerized via a free radical photoinitiator to give acrylate polymers. The two polymerization types procede separately to give substantially independent, interpenetrating polymer networks. The properties of the resulting Dual Cure compositions are often found to be superior to either component alone. The objective of the Dual Cure program is to eliminate solvents from coating composition, while simultaneously maintaining or improving the physical properties of the coating and the processing conditions used to prepare them. This will lead to reductions in solvent use, with a resulting reduction in energy consumption and solvent emissions. 9 figs.