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US 6,280,512 B1Granted
Waterfast color inks for ink jet printing
AssigneeScitex Digital Printing, Inc.
InventorRaouf Botros
Life of this patent
Estimating the term…
Abstract
An ink jet ink composition comprises a color dye, a polymer, at least one water soluble organic solvent, and at least one ammonium salt for enhancement of waterfastness. The ink preferably comprises 1-10% ethoxylated polyethyleneimine to which is added 1-8% N-methyl-pyrrolidone, and up to 1% of the ammonium salt, to increase the waterfastness of the ink to a level greater than 70%.
Claims12
An ink jet ink composition comprising a liquid vehicle, a non-black dye, a polymer, 1% to 8% by weight of N-methyl-pyrrolidone, and at least one ammonium salt, for enhancement of waterfastness.
Dependencies are inferred from the claim text.