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US 4,719,293 AGranted
(2,5-diisopropoxycarbonylbenzene-azo-2-hydroxy-3-carbamoyl naphthalene) pigment
AssigneeCiba-Geigy Corporation
InventorKarl Ronco
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Abstract
The invention relates to disazo pigments of the formula ##STR1## wherein R is an ethyl, propyl or isopropyl radical. These pigments colour plastics, especially rigid PVC, in brown shades of excellent fastness properties.
Claims1
The compound of the formula ##STR4##
Dependencies are inferred from the claim text.