Transparent greenish yellow pyrazolone pigments

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°, a chroma of 58-62 and a luminosity ≧87 (measuring angle 45°, standard illuminant D65). chemistry chemdraw filechemistry mol file