Process for the continuous preparation of quinacridones

Details Process for the continuous preparation of quinacridones Process for the continuous preparation of quinacridones

C - Chemistry, Metallurgy

09

B

C09B 48/00 (2006.01)

Patent

CA 2312167

This invention relates to a continuous process for the preparation of quinacridone pigments by (a) preparing a reaction mixture by mixing (i) a 2,5-dianilinoterephthalic acid or ester thereof, and (ii) at least about 0.5 parts by weight, per part of component (a)(i), of a dehydrating agent; (b) passing the reaction mixture through a continuous reactor having one or more heated zones at a temperature of about 80°C to about 300°C to form a crude quinacridone composition; and (c) mixing a continuous stream of the crude quinacridone composition with a liquid in which the quinacridone pigment is substantially insoluble at a ratio of about 0.5 to about 15 parts by weight of the liquid per part by weight of the crude quinacridone composition.

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