Ultraviolet curable cqvercoat material for flexible circuitry

Ultraviolet light is finding increasing use in a variety of imaging and non-imaging applications. Many of the UV-curable polymeric systems used in the electronics industry today are based on vinyl polymerization, especially of acrylates, which are generally quite brittle when cured. The system under consideration in this paper is different. It involves the UV initiated addition of a thiol group to a carbon — carbon double bond to give a flexible film.