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US 9,309,424 B2Granted
Media sheet coatings
AssigneeHewlett-Packard Development Company, L.P.
InventorsRhadha Sen, Richard J. McManus
Life of this patent
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Abstract
A coating for a substrate is formed by milling cationic pigment particles in the presence of a water-soluble polymer, where the water-soluble polymer acts as a binder and a dispersant for the cationic pigment particles.
Claims17
A method of forming a coating for a substrate, comprising:
- milling cationic calcium carbonate particles in the presence of a polyvinyl alcohol, wherein the polyvinyl alcohol acts as a binder and a dispersant for the cationic calcium carbonate particles.
A method of forming a coating for a substrate, comprising:
- adding a slurry of cationic calcium carbonate particles to a bead mill;
- adding nonionic polyvinyl alcohol to the bead mill;
- milling the cationic calcium carbonate particles in the presence of the nonionic polyvinyl alcohol;
- and
- during milling, adsorbing the nonionic polyvinyl alcohol onto the surfaces of the cationic calcium carbonate particles so as to disperse the cationic calcium carbonate particles in the coating;
- wherein the nonionic polyvinyl alcohol further acts as a binder for the cationic pigment particles when the coating is dried.
3 more elements
Dependencies are inferred from the claim text.