Patent ID: 7635504

Claim:
A radiation curable ink composition for ink jet recording comprising a. at least one titanium dioxide white pigment b. a polymerizable vehicle c. at least one additional ingredient selected from the group of consisting of a colorant, a photosensitizer, a photosynergist, a photoinitiator and a surfactant, d. at least one of the titanium dioxide pigments is alumina-treated and stabilized by a mixture of pigment dispersants consisting essentially of i. at least a first acidic polyester dispersant, and ii. at least an second acrylic structured copolymer dispersant, wherein the radiation curable ink composition is substantially free of solvent, and wherein the polymerizible vehicle is a mixture of mono-functional and multi-functional monomers and the mixture of monomers is at least 50 weight % by weight of the total weight of the ink.