Black ink-jet inks with reduced lightness and haze
AssigneeHewlett-Packard Development Company, L.P.
InventorsSukanya Rengaswamy, Zia Ur Rehman, Mary E. Austin
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Abstract
A method of decreasing L*min and reducing stacked haze in a black region of an ink-jet printed image is disclosed which includes providing an ink-jet ink receptive medium and ink-jetting at least one ink-jet ink onto the medium to form a printed medium including an image having at least one black region. At least one of the ink-jet inks includes a black ink-jet ink including a liquid vehicle and a certain black azo dye having the Formula 1. The method includes stacking the printed medium, to obtain a printed medium having decreased L*min and reduced stacked haze in the black region(s).
Claims16
A method of decreasing L*min and reducing stacked haze in a black region of an ink-jet printed image, comprising:
- ink-jetting at least one ink-jet ink onto an ink-jet ink receptive medium to form a printed medium comprising an image having at least one black region,
- wherein at least one said ink-jet ink includes a black ink-jet ink comprising:
- a liquid vehicle, and
- at least one black azo dye having the formula:
- wherein X is SO3O;
- R is unsubstituted C1-4-alkyl;
- Q is K+, Na+ or Li+, or any combination of those;
- m is 1 or 2;
- and n is 1, 2 or 3;
- and
- stacking said printed medium, to obtain a printed medium having decreased L*min and reduced stacked haze in said at least one black region, relative to a printed medium printed with an ink-jet ink lacking said at least one black azo dye.
Dependencies are inferred from the claim text.