Oxidation process for preparing quinacridone pigments

Details Oxidation process for preparing quinacridone pigments Oxidation process for preparing quinacridone pigments

C - Chemistry, Metallurgy

09

B

C09B 48/00 (2006.01) C09B 67/52 (2006.01)

Patent

CA 2076281

P-18766/A/CGC 1571 OXIDATION PROCESS FOR PREPARING QUINACRIDONE PIGMENTS Abstract of the Disclosure A process for preparing quinacridone pigments comprising oxidizing 6,13-dihydro-quinacridone or derivatives thereof at elevated temperatures in the presence of a base, dimethyl sulfoxide medium and a quinone catalyst, drowning the resulting pigmentsolution to precipitate the quinacridone pigment and isolating the desired quinacridone product.

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