Finely divided highly transparent diketopyrrolopyrrole pigments

Details Finely divided highly transparent diketopyrrolopyrrole pigments Finely divided highly transparent diketopyrrolopyrrole pigments

1994-07-21

1995-12-19

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

524 92, 524597, 524720, C07D48704, C08K 534

Patent

active

054769493

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.

REFERENCES:
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patent: 4659775 (1987-04-01), Pfenninger et al.
patent: 4720305 (1988-01-01), Iqbal et al.
patent: 4931566 (1990-06-01), Surber et al.
patent: 5342955 (1994-08-01), Wooden et al.

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