POLYETHYLENE IMINE WATERFAST LIQUID INKS
Original Publication Date: 1995-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
Disclosed are formulations for aqueous polyethylene imine based inks having improved waterfastness properties for use in high speed, low volume thermal ink jet printers. Ink formulations containing polyethylene imines and derivatives thereof enable inks with substantially lower pH values and superior waterfastness properties. It is believed that a synergistic effect operates to provide the improved observed waterfastness properties observed when the polyethylene imine compounds are used in conjunction with certain dye stuffs, for example, Direct Black 154, and a cosolvent such as sulfolane or pyrollidone, and solvent mixtures thereof.