C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 48/00 (2006.01)
Patent
CA 2246109
This invention relates to a process for the preparation of quinacridone pigments by (a) exposing a reaction mixture containing (i) 2,5-dianilinoterephthalic acid, 2,5-dianilino-3,6-dihydrotere- phthalic acid, 2,5-dianilino-3,6-dioxo-1,4-cyclohexadiene-1,4- dicarboxylic acid, and/or derivatives thereof, (ii) about 3 to about 20 parts by weight, per part of component (a)(i), of a dehydrating agent, and (iii) 0 to about 20 parts by weight, per part of component (a)(i), of a pigment additive, to microwave radiation under conditions that raise the bulk temperature of the reaction mixture to no more than about 250°C, with the proviso that if component (a)(i) 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 in about 3 to about 15 parts by weight, per part of component (a)(i), of a liquid in which the quinacridone pigment is substantially insoluble; (c) isolating the quinacridone pigment; and (d) optionally, conditioning the pigment.
Corporation Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Sun Chemical Corporation
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