Patent ID: 7893127

Claim:
A radiation curable and jettable ink composition, comprising the following components: (a) an oligomer containing a mono-ethylenically unsaturated radiation curable functional group; (b) an ethylenically unsaturated monofunctional monomer; (c) optionally, an oligomer or a monomer each said oligomer or monomer containing ethylenically unsaturated polyfunctional groups; and (d) optionally, a chain transfer agent; wherein components (a) and (c) combined by weight is less than components (b) and (d) combined by weight and further wherein the ink composition is (1) substantially free of solvent, (2) has a viscosity at 25° C. of not greater than about 70 cPs, and (3) when cured by radiation forms an ink having an elongation of at least about 150%.