Patent ID: 8372898

Claim:
An aqueous cyan inkjet ink composition for use in ink jet printers comprising: (a) from about 1.0% to about 5.0% by weight, based on the total weight of the cyan inkjet ink composition, of a self-dispersed cyan pigment; (b) from about 15.0% to about 25.0% by weight, based on the total weight of the cyan inkjet ink composition, of a cosolvent mixture having: (1) a C 2 -C 8 terminal alkanediol or a mixture thereof; (2) a polyol/polyalkylene oxide condensate having the formula wherein X is H or C 1 -C 6 alkyl, R is H, C 1 -C 6 alkyl or CH 2 O(CH 2 CH 2 O) e H, b is 0 or 1, a+d+f (c+e) is from about 2 to about 100, and f is from about 1 to about 6; (3) a cyclic amide or its derivative; (4) a trihydric alcohol; (c) from about 0.5% to about 2.0% by weight, based on the total weight of the cyan inkjet ink composition, of a surfactant; (d) from about 0.1% to about 2.0% by weight, based on the total weight of the cyan inkjet ink composition, of a polymeric additive; and (e) the balance an aqueous carrier, wherein the ink has excellent printhead maintenance, startup, print quality and minimized kogation.