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Abstract

The present Application relates to pigment colourants of formula ##STR1## wherein R.sub.1 is C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkoxy, phenoxy or halogen, R.sub.2 is hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkoxy, phenoxy, halogen, acylamino, --CH.sub.2 NHacyl or the radical ##STR2## and R.sub.3 is C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkoxy, phenoxy or halogen, the ring A may be further substituted by --SO.sub.3.sup.-M.sup.+, wherein M.sup.+ is a cation, and the rings B and C may be unsubstituted or further mono- or poly-substituted by halogen, hydroxy, --SH, amino, C.sub.1 -C.sub.6 alkylamino, C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 alkoxy, phenoxy, acylamino, C.sub.1 -C.sub.6 thioalkyl or by thiophenyl, and the ring B may be substituted in the 5- or 8-position by a radical of formula ##STR3## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above, to a process for their preparation, and to their use in the mass-coloring of synthetic materials.

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