C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
C09B 48/00 (2006.01) C09B 57/00 (2006.01)
Patent
CA 2199599
This invention relates to a process for the preparation of quinacridone pigments by (a) ~heating, at a temperature of about 80°C to about 145°C, a reaction mixture containing (i) ~2,5-dianilinoterephthalic acid, a 2,5-dianilino-3,6- dihydroterephthalic acid ester, and/or a derivative thereof, (ii) ~about 3 to about 15 parts by weight, per part of component (a)(i), of a dehydrating agent, and (iii) ~about 0.1 to about 15 percent by weight, based on component (a)(i), of one or more non-pigmentary aromatic polycyclic compounds and/or derivatives thereof, with the proviso that if component (a)(i) is a 2,5-dianilino-3,6-dihydroterephthalic acid ester or a derivative thereof, reaction step (a) additionally comprises an oxidation step; (b) ~drowning the reaction mixture from step (a) by adding said reaction mixture to 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; (d) ~optionally, conditioning the quinacridone pigment; and (e) ~optionally, blending the resultant pigment with one or more quinacridone derivatives.
Badejo Ibraheem T.
Rice Daphne J.
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Sun Chemical Corporation
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