Transparent greenish yellow pyraziolonazopigmente

摘要

The invention relates to pyrazolone pigments of general formula (I), wherein the radicals R1, R2, R3 and R4 independently represent hydrogen, chlorine, methyl or ethyl, whereby at least one of the radicals R1 - R4 is different from hydrogen. The inventive pigments are characterised by a CIELAB colour angle of 80 - 85 DEG , a chroma of 58 - 62 and a luminosity /= 87 (measuring angle 45 DEG , standard illuminant D65).