Finely divided highly transparent diketopyrrolopyrrole pigments
AssigneeCiba-Geigy Corporation
InventorsOlof Wallquist, Gary Wooden, Thomas Eichenberger, Ingo Schloder
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Abstract
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.
Claims22
Finely divided 1,4-diketopyrrolo[3,4-c]pyrroles of the formula ##STR10## where A and B are each independently of the other a radical of the formula ##STR11## where R.sub.1 and R.sub.2 are each independently of the other hydrogen, halogen, C.sub.1 -C.sub.5 alkyl or phenyl, wherein at least 84% by weight of the particles have a Stokes equivalent diameter of .ltoreq.0.25 .mu.m, and mixtures thereof.
Dependencies are inferred from the claim text.