| 摘要 |
PROCESS FOR THE PREPARATION OF DISPERSIBLE QUINACRIDONES The present invention relates to a process for conditioning quinacridone pigments by (a) preparing an aqueous slurry of a crude quinacridone; (b) thoroughly mixing the aqueous slurry with about 0.3 to about 2.9 parts by weight, relative to the quinacridone, of at least one C1-C12 alkyl ester of a C7-C12 aromatic carboxylic acid at a temperature of between about 70.degree.C and about 200.degree.C; (c) hydrolyzing the alkyl ester used in step (b); and (d) collecting the quinacridone pigment.
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