White inks
AssigneeHewlett-Packard Development Company, L.P.
InventorsVladek Kasperchik, Paul Joseph Bruinsma, Marcos A. Barreto
Life of this patent
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Abstract
The present disclosure provides an example of a white ink. The ink includes an aqueous ink vehicle and from 5 wt % to 60 wt % of a white flocculated colorant mass. The white flocculated colorant mass can include white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm, silica coated on the white metal oxide pigment to form a silica-coated pigment, and a polymeric dispersant associated with a surface of the silica-coated pigment.
Claims20
A white ink, comprising:
- an aqueous ink vehicle;
- and
- from 5 wt % to 60 wt % of a white flocculated colorant mass, comprising:
- white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm,
- silica coated on the white metal oxide pigment forming a silica-coated pigment, wherein the white metal oxide pigment content to silica content is from 100:3.5 to 5:1 by weight, and
- a polymeric dispersant associated with a surface of the silica-coated pigment.
A method of making a white ink, comprising:
- milling a white metal oxide pigment coated with precipitated silica in a water-based carrier with a polymeric dispersant to form a white dispersion containing a suspended white colorant, the suspended white colorant, comprising:
- white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm,
- silica coated on the white metal oxide pigment forming a silica-coated pigment, wherein the white metal oxide pigment content to silica content is from 100:3.5 to 5:1 by weight, and
- a polymeric dispersant associated with the silica-coated pigment;
- and
- admixing an aqueous liquid vehicle with the white dispersion to form a white ink.
A fluid set for inkjet imaging, comprising:
- a white ink, comprising:
- an aqueous ink vehicle;
- from 5 wt % to 60 wt % of a white flocculated colorant mass suspended in the aqueous ink vehicle, said white flocculated colorant mass, comprising:
- white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm,
- silica coated on the white metal oxide pigment forming a silica-coated pigment, wherein the white metal oxide pigment content to silica content is from 100:3.5 to 5:1 by weight, and
- a polymeric dispersant associated with the silica-coated pigment;
- and
- a fixer fluid, comprising:
- aqueous fixer vehicle, and
- from 0.1 wt % to 25 wt % cationic polymer.
Dependencies are inferred from the claim text.