US Patent 7537654 Quinacridone nanoscale pigment particles and methods of making same
Patent 7537654 was granted and assigned to Xerox on May, 2009 by the United States Patent and Trademark Office.
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A process for preparing coated nanoscale quinacridone pigment particles, includes: mixing a quinacridone pigment precursor or crude quinacridone pigment with a first solution including an acid to form nanoscale quinacridone pigment particles; adding the first solution and formed nanoscale quinacridone pigment particles into a second solution including deionized water to form a third solution and to precipitate the nanoscale quinacridone pigment particles; and washing the precipitated nanoscale quinacridone pigment particles in a fourth solution including a surface additive compound, whereby the surface additive compound coats the nanoscale quinacridone pigment particles; wherein the surface additive compound is a rosin compound.
US Patent 07537654 Quinacridone nanoscale pigment particles and methods of making same US Patent 7537654 Quinacridone nanoscale pigment particles and methods of making same
US Patent 07537654 Quinacridone nanoscale pigment particles and methods of making same
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