White pigment dispersions
AssigneeHewlett-Packard Development Company, L.P.
InventorsPaul Joseph Bruinsma, Vladek Kasperchik, Thomas W. Butler
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Abstract
The present disclosure provides white pigment dispersions, which can include an aqueous liquid vehicle, and from 5 wt % to 70 wt % of a white metal oxide pigment dispersed by two co-dispersants. The metal oxide pigment can have an average particulate size from 100 nm to 1 μm, and the co-dispersants can include both i) a short-chain anionic dispersant having a weight average molecular weight ranging from 1,000 Mw to 30,000 Mw, and ii) a non-ionic or predominantly non-ionic dispersant.
Claims15
A white pigment dispersion, comprising:
- an aqueous liquid vehicle;
- and
- from 5 wt % to 70 wt % of a white metal oxide pigment dispersed by two co-dispersants, wherein the metal oxide pigment has an average particulate size from 100 nm to 1 μm, and wherein the co-dispersants include both i) a short-chain anionic dispersant having a weight average molecular weight ranging from 1,000 Mw to 30,000 Mw, and ii) a non-ionic or predominantly non-ionic dispersant.
A method of making a white pigment dispersion, comprising milling a slurry including from 5 wt % to 70 wt % of a white metal oxide pigment in an aqueous liquid vehicle with co-dispersants, the co-dispersants including both i) a short-chain anionic dispersant having a weight average molecular weight ranging from 1,000 Mw to 30,000 Mw, and ii) a non-ionic or predominantly non-ionic dispersant.
A fluid set for inkjet imaging, comprising:
- 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 1,000 nm, and being milled in the presence of co-dispersants including both i) a short-chain anionic dispersant having a weight average molecular weight ranging from 1,000 Mw to 30,000 Mw, and ii) a non-ionic or predominantly non-ionic dispersant, and
- from 2 wt % to 30 w % latex particulates;
- 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.