Patent ID: 7109253

Claim:
A radiation curable composition comprising: (a) an acrylate functional urethane oligomer having a hydrocarbon backbone; (b) 5-50 wt %, relative to the total weight of the composition, of one or more polyfunctional diluents selected from the group consisting of polyacrylated alkyl monomers, bisphenol A diacrylate, and ethoxylated bisphenol A diacrylate; (c) a (meth)acrylate ester of phosphoric acid; (d) 1.0 to 10 wt %, relative to the total weight of the composition, of a photoinitiator; and (e) 5-50wt %, relative to the total weight of the composition, of one or more monofunctional diluents selected from the group consisting of alkyl (meth)acrylate monomers, N-vinyl functional diluents, and vinyl ether functional diluents; wherein said composition, after cure, has a dielectric dissipation factor at 60 Hz and 150° C. of lower than about 0.2; and at least one Tg of below 20° C.