Ink-jet inks and ink sets providing excellent gamut, image quality, and permanence
AssigneeHewlett-Packard Development Company, L.P.
InventorsPaul Tyrell, Patricia A Wang, Charles G. Dupuy
Life of this patent
Estimating the term…
Abstract
The present invention is drawn to ink-jet inks that can be used with cyan, magenta, and yellow ink set systems for improved image gamut and lightfastness while maintaining good chroma in the case of color ink and lightness in the case of black ink. More specifically, in an embodiment of the invention, ink sets can comprise specific ink-jet inks having low dye load dyes for use in six-ink systems, for example.
Claims21
A magenta ink for ink-jet printing, comprising:
- an ink vehicle;
- and a magenta dye having the chemical structure
- wherein each M is independently H or a monovalent ion.
An ink set for ink-jet printing, comprising:
- a three-ink ink set of cyan ink, magenta ink, and yellow ink;
- and
- a second magenta ink having a magenta dye load from 0.1% to 7.0% by weight, said magenta dye having the structure
- wherein each M is independently H or a monovalent ion.
An ink set for ink-jet printing, comprising:
- a three-ink ink set of cyan ink, magenta ink, and yellow ink;
- and
- a black ink having a black dye load from 0.1% to 10.0% by weight, said black dye having the structure
- wherein each M is independently H or a monovalent ion.
A six-pen ink set for ink-jet printing, comprising:
- a magenta ink-jet ink having a dye load from 2.0% to 7.0% by weight;
- a second magenta ink-jet ink having a dye load from 0.1% to 2.0% by weight, and having the structure
- wherein M is a member selected from the group consisting of H+, Na+, Li+, K+, NH4+, and combinations thereof, with the proviso that the magenta ink-jet ink and the second magenta ink-jet ink are not the same composition;
- a black ink-jet ink having a dye load from 0.1% to 10.0% by weight;
- a cyan ink-jet ink having a dye load from 2.0% to 7.0% by weight;
- a second cyan ink-jet ink having a dye load from 0.1% to 2.0% by weight, with the proviso that the cyan ink-jet ink and the second cyan ink-jet ink are not the same composition;
- and
- a yellow ink-jet ink having a dye load from 2.0% to 10.00% by weight.
A six-pen ink set for ink-jet printing, comprising:
- a magenta ink-jet ink having a dye load from 2.0% to 7.0% by weight;
- a second magenta ink-jet ink having a dye load from 0.1% to 2.0% by weight, with the proviso that the magenta ink-jet ink and the second magenta ink-jet ink are not the same composition;
- a black ink-jet ink having a dye load from 0.1% to 10.0% by weight, and having the structure
- wherein M is a member selected from the group consisting of H30 , Na+, Li+, K+, NH4+, and combinations thereof;
- a cyan ink-jet ink having a dye load from 2.0% to 7.0% by weight;
- a second cyan ink-jet ink having a dye load from 0.1% to 2.0% by weight, with the proviso that the cyan ink-jet ink and the second cyan ink-jet ink are not the same composition;
- and
- a yellow ink-let ink having a dye load from 2.0% to 10.0% by weight.
Dependencies are inferred from the claim text.