Ciba-geigy Corporation

Ciba Specialty Chemicals Corporation

Gary Wooden

Olof Wallquist

Guy De Weck

Ingo Schloder

Laurent Chassot

Thomas Eichenberger

Robert Moretti

Compounds of formula ##STR1## wherein R and R' are each independently of the other hydrogen, C.sub.1 -C.sub.18 alkyl, COR.sub.1, COR.sub.2 or COOR.sub.1,

Polycyclic compounds

Pigment compositions of diketopyrrolopyrroles

The pigment form of the diketopyrrolopyrrole pigment of formula ##STR1## having high saturation, characterised by a chroma C*.sub.ab of at least 45 in the CIELAB system when incorporated in a plasticised PVC pressed sheet. This pigment has superior opacity and an unexpectedly high chroma.

Diketopyrrolopyrrole pigment with high chroma

Finely divided 1,4-diketopyrrolo[3,4-c]pyrroles of the formula ##STR1## where A and B are each independently of the other a radical of the formula ##STR2## wherein at least 84% by weight of the particles have a Stokes equivalent diameter of .ltoreq.0.25 .mu.m, and mixtures thereof. The substituents R.sub.1 and R.sub.2 are defined in claim 1. These pigments are notable for a very pure hue and outstanding transparency.

Finely divided highly transparent diketopyrrolopyrrole pigments

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

Diketopyrrolopyrroles and pigments thereof

Diketopyrrolopyrroles of formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently of one another hydrogen, chloro, C.sub.1 -C.sub.4 alkyl, methoxy, phenyl, cyano or a group

Diketopyrrolopyrroles containing nitroxyl groups

Diketopyrrolopyrroles

Pigment compositions

Dianthraquinonyl compounds of formula ##STR1## wherein X is a radical R.sub.1, R.sub.2, R.sub.3 or R.sub.4, and

Dianthraquinonyl compounds

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

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Oberschrot, Switzerland

Gary Wooden