Patent ID: 8153163
Filing Date: 2012-04-10
Classification: A61K,A61Q,C01P,C09C,C09D,Y10T

Abstract:
1. A process for producing a pearl pigment comprising: (A) adding an aqueous solution of a colored metal oxide precursor to an aqueous dispersion of a flaky powder so that the amount of metal ion is 5×10 adding an alkaline solution to the mixed solution so that the pH of the mixed solution is adjusted to 5 to 8; separating the solid from the mixed solution; baking the separated solid at 500 to 1000° C. to obtain a pearl pigment; suspending the obtained pearl pigment in water; adding an aqueous solution of a colorless metal or colorless metal oxide precursor to the suspension; adding an alkaline solution to the mixed solution so that the pH of the mixed solution is adjusted to 5 to 8; separating the solid from the mixed solution; and baking the separated solid at 500 to 1000° C.; or (B) adding an aqueous solution of a colored metal oxide precursor to an aqueous dispersion of a flaky powder so that the amount of metal ion is 5×10 adding an alkaline solution to the mixed solution so that the pH of the mixed solution is adjusted to 5 to 8; separating the obtained solid from the mixed solution; adding an aqueous solution of a colorless metal or colorless metal oxide precursor to a dispersion of the solid; separating the obtained solid from the mixed solution; and baking the separated solid at 500 to 1000° C.