| 摘要 |
A process for the preparation of deeply colored organic pigments by crystallizing finely divided crude organic pigments, whose primary particles have a size of </=0.2 mu m, in C3-C5-alkanes, C3-C5-alkenes or C1-C3-chloroalkanes at from 40 DEG to 250 DEG C. to under atmospheric pressure or superatmospheric pressure, and isolating the pigment. The pigments obtained by the process give deep, brilliant colorations.
|
