Patent ID: 7897653

Claim:
An ink set comprised of at least one radiation curable fluorescent ink comprising at least one curable monomer or oligomer, a curable gellant comprised of a curable polyamide-epoxy acrylate gellant and a polyamide co-gellant, optionally at least one photoinitiator, at least one curable wax, and at least one fluorescent material, wherein upon exposure to activating energy, the fluorescent material fluoresces to cause a visible change in the appearance of the ink, wherein the curable polyamide-epoxy acrylate gellant is obtained by reacting epoxy groups with an ethylenically unsaturated acid, wherein the at least one radiation curable fluorescent ink has a viscosity of less than about 50 mPa·s at a jetting temperature of about 40° C. to about 110° C., the viscosity of the at least one radiation curable fluorescent ink increasing by at least about 10 2.5 mPa·s upon gelling of the at least one radiation curable fluorescent ink at a temperature lower than the jetting temperature and in the temperature range of about 30° C. to about 70° C., and wherein the at least one radiation curable fluorescent ink has a storage modulus of at least about 10 2 Pa in the temperature range of 30° C. to 50° C., and wherein the at least one curable wax is a hydroxyl-terminated polyethylene wax functionalized with a curable group selected from the group consisting of allylic ether and oxetane or the at least one curable wax is a carboxylic acid-terminated polyethylene wax functionalized with a curable group selected from the group consisting of acrylate, methacrylate, allylic ether, and oxetane.