TRANSPARENT GREENISH YELLOW PYRAZOLONEAZO PIGMENTS

摘要

This invention relates to appear in formula I, in the CIELAB color of from 80 to 85 degrees, 58 to 62 chromaticity and luminance 87 relates to one of pyrazolone azo pigments having the characteristics of (45 measuring angle , D65 light source ). ; formula I ; wherein R ¹ , R ² , R ³ , and R ⁴ have been each hydrogen, chlorine, methyl or ethyl , with the proviso that R ¹ -R ⁴ at least one is not hydrogen .