Diketopyrrolopyrroles

Abstract

1,4-Diketopyrrolo[3,4-c]pyrroles of formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen, Cl, Br, CH.sub.3, OCH.sub.3, CN or phenyl, and at least one of the substituents, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is a group --O(CH.sub.2).sub.n X or --O(CH.sub.2 CH.sub.2 O).sub.p CH.sub.2 CH.sub.2 X wherein n is an integer from 2 to 12, and p is an integer from 1 to 3, X is a heterocyclic radical selected from the group consisting of imidazolyl, pyrazolyl, triazolyl, piperazinyl, pyridinyl, pyrrolyl, thiazolyl, oxazolyl, benzoxazolyl, indolyl, benzthiazolyl, benzimidazolyl, benzotriazolyl, morpholinyl, piperidinyl and pyrrolidinyl, which radical is unsubstituted or substituted by one or two methyl groups, or is a group --NR.sub.5 R.sub.6 or --N[(CH.sub.2).sub.n --NR.sub.5 R.sub.6 ].sub.2, wherein R.sub.5 and R.sub.6 are each independently of the other hydrogen, C.sub.1 -C.sub.6 alkyl or C.sub.5 -C.sub.6 cycloalkyl. Pigment compositions comprising a minor amount of said compounds and diketopyrrolopyrrole pigments have excellent rheological and coloristic properties, especially in paint systems and in printing inks.

Dependencies are inferred from the claim text.