C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 48/00 (2006.01)
Patent
CA 2146603
This invention relates to a process for the preparation of quinacridone pigments comprising (a) heating, at a temperature of about 80°C to about 145°C, a reaction mixture comprising (i) 2,5-dianilinoterephthalic acid or a 2,5-dianilinoterephthalic acid derivative having one or more substituents in at least one aniline ring, (ii) about 2 to about 10 parts by weight, relative to component (i), of a strong acid, and (iii) at least about 0.4 mole percent, relative to component (i), of iron in the form of an iron salt; (b) drowning the reaction mixture from step (a) by adding said reaction mixture to about 3 to about 15 parts by weight, relative to component (i), of a liquid in which the pigment is substantially insoluble; (c) isolating the quinacridone pigment; and (d) optionally, conditioning the quinacridone pigment.
Campos Margot
Franke Guenter
Greene Michael J.
Pfuetzenreuter Dirk
Miles Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Sun Chemical Corporation
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