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US 6,805,736 B2Granted
Pen-compatible black and color inkjet inks having improved bleed control
AssigneeHewlett-Packard Development Company, L.P.
InventorPalitha Wickramanayake
Life of this patent
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AssigneeHewlett-Packard Development Company, L.P.
InventorPalitha Wickramanayake
Estimating the term…
Ink sets that are particularly suitable for inkjet printing over a large range of uncoated papers, have reduced bleed between color and black inks, and include black and color inks that are mutually compatible in pens. The ink sets include at least one pigment-based black ink having cationic and anionic dispersant groups, and at least one color dye or pigment that interacts with the black ink when printed on a receiving medium. The black pigment is self-dispersed and is dual treated with cationic and anionic dispersant groups. When printed onto an alkaline medium, the black pigment will carry a net negative charge that will interact with the positively charged color dyes and/or pigments and, thus, be bleed arrested. When printed onto an acidic medium, the black pigment will have a positive charge, will interact with the negatively charged color dyes and/or pigments, and thus be bleed arrested.
An inkjet ink set for inkjet printing comprising:
An inkjet ink set for inkjet printing comprising:
A method of maintaining compatibility between black and color inkjet inks and reducing black to color bleed when black and color inks are printed, the method comprising:
Dependencies are inferred from the claim text.