C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 48/00 (2006.01) C09B 67/22 (2006.01)
Patent
CA 2219294
This invention relates to a process for the preparation of quinacridone pigments by (a) heating a reaction mixture comprising (i) a 2,5-dianilinoterephthalic acid, a 2,5-dianilino- 3,6 - dihydroterephthalic acid, or a 2,5-dianilino-3,6-dioxo-1,4- cyclohexadiene-1,4-dicarboxylic acid; (ii) about 0.1 to about 15 percent by weight, based on component (a)(i), of one or more sulfonyl-containing derivatives of 2,5-dianilinoterephthalic acid, 2,5-dianilino- 3,6 -dihydroterephthalic acid, and/or 2,5-dianilino-3,6-dioxo- 1,4-cyclohexadiene-1,4-dicarboxylic acid; and (iii) about 3 to about 20 parts by weight, per part of component (a)(i), of a dehydrating agent, with the proviso that if either component (a)(i) or component (a)(ii) is a 2,5-dianilino- 3,6 -dihydroterephthalic acid or derivative thereof, reaction step (a) additionally comprises an oxidation step; (b) drowning the reaction mixture from step (a) with a liquid in which the quinacridone pigment is substantially insoluble; and (c) isolating the quinacridone pigment.
Badejo Ibraheem T.
Britanak John F.
Rice Daphne J.
Corporation Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Sun Chemical Corporation
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