Quinacridone nanoscale pigment particles and methods of making same
AssigneeXerox Corporation
InventorsRoger E. Gaynor, C. Geoffrey Allen
Life of this patent
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Abstract
A process for preparing coated nanoscale quinacridone pigment particles, includes providing a first solution containing a surface additive compound in an acid; adding a quinacridone pigment precursor or crude quinacridone pigment into the first solution and causing the surface additive compound to coat formed nanoscale quinacridone pigment particles; and adding the first solution and coated nanoscale quinacridone pigment particles into a second solution containing deionized water to form a third solution and to precipitate the coated nanoscale quinacridone pigment particles; wherein the surface additive compound is a rosin compound.
Claims20
A process for preparing coated nanoscale quinacridone pigment particles, comprising:
- providing a first solution comprising a surface additive compound in an acid;
- adding a quinacridone pigment precursor or crude quinacridone pigment into the first solution and causing said surface additive compound to coat formed nanoscale quinacridone pigment particles;
- and
- adding the first solution and coated nanoscale quinacridone pigment particles into a second solution comprising deionized water to form a third solution and to precipitate the coated nanoscale quinacridone pigment particles;
- wherein the surface additive compound comprises a rosin compound.
Dependencies are inferred from the claim text.