Abstract: A demand or impulse ink jet ejects droplets of hot melt ink. The hot melt ink is heated from a solid state to a liquid state in the jet prior to the ejection of droplets on demand. The ink is then cooled on striking the target. The ink may contain a wax.

Abstract: A novel impulse ink jet ink for use with an ink jet system having material subject to corrosion by said ink is disclosed. The subject ink comprises a fatty acid vehicle, a colorant, and amounts of anti-oxidant, preferably an alkylated hydroquinone, which are effective to substantially reduce the rate of corrosion on metallic parts of the system. The preferred anti-oxidant, which comprises 0.1-5 wt % of the ink, is an alkylated hydroquinone, particularly butylated hydroquinone. The subject ink preferably comprises an oleic acid vehicle, and a vehicle additive selected from the group consisting of aromatic alcohols, aromatic ethers, dimethylsulfoxides, alkyl pyrrolidones, methoxy- and ethoxy- triglycols, aliphatic ketones, and mixtures thereof. The corrosive nature of such inks is potentiated by the relatively high percentages of the vehicle-soluble dyes in the ink. Such dyes are present in amounts up to 20 wt % of the ink.

Abstract: A stearic acid-containing ink jet ink for use in an ink jet apparatus which features good print quality. The ink jet ink is discharged from the ink jet ink apparatus at elevated temperatures above ambient.

Abstract: An ink jet ink formulated to substantially reduce or eliminate start-up problems when an ink jet apparatus is initially discharged. The ink comprises at least two fluid components. The components have been matched to provide an ink that substantially maintains its initial formulation despite evaporation of the components.

Abstract: A natural wax-containing ink jet ink for use in an ink jet apparatus which features good print quality. The ink jet ink is discharged from the ink jet ink apparatus at elevated temperatures above ambient.

Abstract: An ink jet ink formulated to substantially reduce or eliminate start-up problems when an ink jet apparatus is initially discharged. The ink comprises at least two fluid components. The components have been matched to provide an ink that substantially maintains its initial formulation despite evaporation of the components.

Abstract: A natural wax-containing ink jet ink for use in an ink jet apparatus which features good print quality. The ink jet ink is discharged from the ink jet ink apparatus at elevated temperatures above ambient.

Abstract: An ink jet composition and method of applying same is featured providing exceptionally good print quality on a wide range of printing papers. The ink composition includes a mixture of oleic acid in an approximate weight of from 20 to 80 percent of the total mixture and a dye in a dye solvent. The mixture is jetted at a temperature of approximately 135.degree. F. The average dot circularity for a dot jetted upon the paper is approximately 0.7 or better.

Abstract: The invention features a process and composition for reducing or eliminating moisture in fluids suitable for use in ink jet systems without significantly changing the surface tension of these fluids. It has been discovered that mixing at least one borate ester derived from an aqueously miscible organic hydroxyl-containing compound, with a substantially non-aqueous printing medium will hygroscopically stabilize the printing medium, (maintain the printing medium substantially water-free) without significantly changing its surface tension.