Patent ID: 8592503

Claim:
An aqueous magenta inkjet ink composition for use in ink jet printers comprising: (a) from about 1.0% to about 10.0% by weight, based on the total weight of the magenta inkjet ink composition, of self-dispersed magenta pigment; (b) from about 0.05% to about 1.0% by weight, based on the total weight of the magenta inkjet ink composition, of a xanthene dye selected from the group consisting of Acid Red 51, 52 and 289; (c) from about 0.5% to about 2.0% by weight, based on the total weight of the magenta inkjet ink composition, of a polymeric additive; (d) from about 0.1% to about 3.0% by weight, based on the total weight of the magenta inkjet ink composition, of a surfactant; (e) from about 15.0% to about 25.0% by weight, based on the total weight of the magenta inkjet ink composition, of a cosolvent mixture having: (1) a C 2 -C 8 terminal alkanediol or a mixture thereof; (2) a cyclic amide compound and its derivative or a mixture thereof; (3) a trihydric alcohol or a mixture thereof; and (f) the balance an aqueous carrier, wherein the ink has excellent print quality, idle times, and long heater reliability.