Lexmark International, Inc.

Ashok Vishnu Gangal

Bradley Leonard Beach

James M Mrvos

Terence E Franey

Agnes Kam Zimmer

Anna Marie Pearson

Ann M Piekunka

Sandra Helton McCain

Jerry F Stone

Robin Gant Gnerlich

A jet printing ink composition which results in reduced drop misdirection and missing nozzles is provided. The aqueous-based ink composition includes at least one colorant; a wetting agent; and a co-solvent comprising a substituted or unsubstituted lactam, an amide, or mixtures thereof.

Ink jet ink containing wetting agent

A method for making a dispersion for an ink, and the ink obtained from this method. The method comprises preparing a dispersion comprising colorant agglomerates and reducing the agglomerate size using a plastic medium. The dispersion is formed by dispersing the colorant agglomerates in a dispersant, optionally in the presence of a liquid carrier such as distilled or deionized water. The colorant in the dispersion may be a carbon black, yellow, cyan, or magenta pigment, or a combination thereof. The plastic medium is preferably a grinding medium, such as polystyrene.

Process for preparing pigment dispersions used in inks

Hydroxyethylated polyethyleneimine is added to jet ink having an anionic dye to prevent whisker forming overnight. To avoid excessive viscosity at start-up, the polyethyleneimine is low molecular weight or a low molecular weight hydroxyethylated amine is combined with high molecular weight polyethyleneimine.

Jet inks avoiding solid formation

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Lexington, KY, United States of America

Ashok Vishnu Gangal