Heat-stable diketopyrrolopyrrole pigment mixtures

Details Heat-stable diketopyrrolopyrrole pigment mixtures Heat-stable diketopyrrolopyrrole pigment mixtures

2004-10-04

2008-08-26

Anderson, Rebecca L (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C524S092000

Reexamination Certificate

active

07417154

ABSTRACT:
The present invention relates to a process for the preparation of a mixture comprising at least two structurally different diketopyrrolopyrrole pigments of formula (1) wherein A1and A2are each independently of the other an aromatic or heteroaromatic radical, by reacting a succinic acid ester with at least one unsubstituted or substituted aromatic or heteroaromatic nitrile, which process comprises carrying out the reaction in the presence of at least one compound of formula (2) wherein A is an aromatic or heteroaromatic radical, R3is hydrogen, halogen, methyl, methoxy, —CF3or —CN, R4is a linear or, from C3upwards, optionally branched C1-C30alkyl, C6-C10aryl or C6-C24aralkyl radical, X is —S—, —O—, —CR5R5′—, —COO—, —CONR5—, —SO—, SO2—, —SO2NR5— or —NR5— and R5and R5′ are each independently of the other hydrogen or a linear or, from C3upwards, optionally branched C1-C30alkyl, C6-C10aryl or C6-C24aralkyl radical, to the use of such a mixture in the coloring of organic material and in cosmetics, and also to novel diketopyrrolopyrrole pigment mixtures

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