White inks
AssigneeHewlett-Packard Development Company, L.P.
InventorsVladek Kasperchik, Thomas W. Butler, Paul Joseph Bruinsma
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Abstract
The present disclosure provides a white ink including an aqueous ink vehicle, from 5 wt % to 50 wt % of a white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm, from 0.1 wt % to 4 wt % of anionic oxide particulates having an average particulate size from 1 nm to 100 nm, from 2 wt % to 30 wt % of latex particulates having a glass transition temperature from 0 C to 130 C, and a non-ionic or predominantly non-ionic dispersant having an acid number not higher than 100 mg KOH/g based on dry polymer weight. The white metal oxide pigment and anionic oxide particulates are present in the white ink at a weight ratio from 5:1 to 200:1.
Claims15
A white ink, comprising:
- an aqueous ink vehicle;
- from 5 wt % to 50 wt % of a white metal oxide pigment having an average particulate size from 100 nm to 2,000 nm;
- from 0.1 wt % to 4 wt % of anionic oxide particulates having an average particulate size from 1 nm to 100 nm;
- from 2 wt % to 30 wt % of latex particulates having a glass transition temperature from 0° C. to 130° C.;
- and
- a non-ionic or predominantly non-ionic dispersant having an acid number not higher than 100 mg KOH/g based on dry polymer weight,
- wherein the white metal oxide pigment and anionic oxide particulates are present in the white ink at weight ratio is from 5:1 to 200:1.
A method of making a white ink, comprising:
- milling a white metal oxide pigment in a water-based carrier with a non-ionic or predominantly non-ionic dispersing agent to form a white metal oxide pigment dispersion, wherein the non-ionic or predominantly non-ionic dispersant is defined by having an acid number not higher than 100 mg KOH/g based on dry polymer weight;
- and
- admixing water, organic co-solvent, anionic oxide particulates, and latex particulates with the white metal oxide pigment dispersion to form a white ink having a white metal oxide pigment to anionic oxide particulate weight ratio from 5:1 to 200:1.
A white thermal inkjet ink, comprising:
- an aqueous inkjet ink vehicle;
- from 10 wt % to 35 wt % of a TiO2 pigment having an average particulate size from 150 nm to 500 nm, wherein the TiO2 pigment is dispersed with a non-ionic or predominantly non-ionic dispersant having an acid number not higher than 30 mg KOH/g based on dry polymer weight;
- and
- from 0.1 wt % to 4 wt % of anionic oxide particulates having an average particulate size from 1 nm to 50 nm, wherein the white metal oxide pigment and anionic oxide particulates are present in the white thermal inkjet ink at weight ratio from 5:1 to 200:1.
Dependencies are inferred from the claim text.