Transparent greenish yellow pyrazolone pigments

US6784286B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Peter Blaschka · Ludwigshafen, DE
• Günter Smeyts · Meckenheim, DE
• Paul Gunthert · Schifferstadt, DE

Key dates

• Filing date: Jun 13, 2003
• Grant date: Aug 31, 2004
• Expiry date: Jun 13, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B63/005
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

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).