TIJ INK COMPOSITIONS WITH IMPROVED LATENCY
Original Publication Date: 1993-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Xerox Disclosure Journal
Disclosed is the use of dye mixtures to improve the latency of thermal ink jet (TIJ) inks. Black TIJ inks were prepared from mixtures of Direct Black 168 and Direct Blue 199. At a constant dye concentration, inks containing cyan colorants were found to have improved or longer latency. The use of cyan does change the hue and optical density of the resulting ink but the inks satisfy latency requirements. The use of Direct Blue 199 and Direct Black 168 based inks enable the preparation of inks meeting the requirements of waterfastness and latency for certain modern high speed low volume TIJ printers. Traditional approaches to improved ink latency have been to: add large amounts of humectants to the ink; to add additives to the ink which improve the solubility of the dye in the water cosolvent ink mixture; and to reduce the concentration of dye.