Patent ID: 6086198
Filing Date: 2000-07-11
Classification: C09D

Abstract:
A set of thermal ink-jet inks for printing at least two different colors on a print medium from an ink-jet pen, with a first ink containing a pigment and an amine dispersant to form a pigment dispersion, said amine dispersant being selected from the group consisting of a quaternized amine dispersant containing at least one quaternized amine functional group and a neutralized amine dispersant containing at least one neutralized amine functional group, and with a second ink containing a bleed-alleviating anion selected from the group consisting of ClO.sub.4.sup.-, PF.sub.6.sup.-, and BF.sub.4.sup.-, said bleed-alleviating anion present in an effective amount to quantitatively combine with said amine dispersant of said first ink to form an insoluble product on said print medium, thereby destabilizing said pigment dispersion and inhibiting migration of said pigment on said print medium.