Organic pigments in color filters liquid of crystal display

US6596446B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Mickey Wolf · Mayesville, US
• Rolf Richter · East Greenwich, US
• Kent Faubion · Leverkusen, DE
• Udo Herrmann · Dormagen, DE
• Josef Witt · Leverkusen, DE
• Peter-Roger Nyssen · Dormagen, DE

Key dates

• Filing date: Apr 3, 2001
• Grant date: Jul 22, 2003
• Expiry date: Sep 18, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G03F7/0007
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to pigment preparations comprising a metal complex of a mono-, di-, tri-, or tetraanion of an azo compound that in its free acid form conforms to formula (I) or a tautomeric form thereof whereinR and R′ are independently OH, NH2, NH—CN, acylamino, or arylamino, andR1 and R1′ are independently —OH or —NH2,with a metal selected from the group consisting of Na, K, Ca, Sr, Ba, Zn, Fe, Ni, Cu, Mn, La, Li, Cs, Mg, Cd, Co, Al, Cr, Sn, and Pb,wherein the metal complex hosts at least one guest compound.