Magenta pigment dispersants
AssigneeHewlett-Packard Development Company, L.P.
InventorsMarcos A. Barreto Caban, June Yang, Elvin Igartua Nieves
Life of this patent
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Abstract
A magenta pigment dispersant can include a mixture of quinacridones including a first quinacridone including two nitrogen- and aromatic-containing pendant groups and a second quinacridone with one nitrogen- and aromatic-containing pendant group.
Claims15
A magenta pigment dispersant comprising a mixture of quinacridones including a first quinacridone including two nitrogen- and aromatic-containing pendant groups and a second quinacridone with one nitrogen- and aromatic-containing pendant group.
A method of manufacturing a magenta pigment dispersant, comprising:
- dissolving pigment violet 19 in sulfuric acid to obtain an acidic solution with pigment violet 19 therein;
- admixing an aromatic amide or imide with the acidic solution to obtain an admixture including the sulfuric acid, the pigment violet 19, and the aromatic amide or imide;
- heating admixture to a temperature from 40° C. to 75° C. for a time period ranging from 15 minutes to 180 minutes;
- cooling the admixture to a temperature ranging from 0° C. to 30° C. to generate a precipitant;
- and
- collecting the precipitant in the form of a magenta pigment dispersant.
An ink composition, comprising,
- a magenta pigment dispersant comprising a mixture of quinacridones including a first quinacridone including two nitrogen- and aromatic-containing pendant groups and a second quinacridone with one nitrogen- and aromatic-containing pendant group;
- a magenta pigment colorant;
- and
- an aqueous liquid vehicle.
Dependencies are inferred from the claim text.