waterproof ir abtastbare inks for ink-jet printing when and where appropriate

摘要

An ink jet ink composition comprises a liquid vehicle, a dye, a hydroxyalkylated polyethyleneimine, and an ammonium salt for enhancement of waterfastness. The ammonium salt preferably comprises less than 1% of the ink composition, and is added to a combination of the dye and ethoxylated polyethyleneimine. The ink jet ink composition increases the waterfastness of the ink to a level greater than 85%.