Patent ID: 8334026

Claim:
A radiation-curable phase-change ink composition, the ink composition comprising: a curable fluorescent co-monomer, wherein the curable fluorescent co-monomer is a coupling product of an acrylate, methacrylate, styryl, vinyl, vinyl ether, or allyl group and a moiety selected from the group consisting of acridines, cyanines, oxazin, fluorenes, rhodamines, fluoresceins, merocyanines, luciferines, xanthenes, thiazoles, pyrenes, and anthracenes; a curable first co-monomer; a gellant in an amount of from about 1% to about 50% by weight of the ink composition; a photoinitiator; and optionally a colorant, wherein the ink composition has a viscosity that is less than about 15 mPa·s at temperatures less than about 110° C., curing the radiation-curable phase-change ink composition by exposure to UV light forms a UV cross-linked material comprising completely cured, UV cross-linked polymers formed from the curable fluorescent co-monomer and the curable first co-monomer and the completely cured, UV cross-linked polymers are fluorescent when exposed to black light.