Process for the preparation of dispersible quinacridones

Details Process for the preparation of dispersible quinacridones Process for the preparation of dispersible quinacridones

C - Chemistry, Metallurgy

09

B

C09B 48/00 (2006.01) C08K 5/3437 (2006.01) C09B 67/10 (2006.01) C09D 7/00 (2006.01) C09D 11/00 (2006.01)

Patent

CA 2102648

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°C and about 200°C; (c) hydrolyzing the alkyl ester used in step (b); and (d) collecting the quinacridone pigment.

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