Patent ID: 6596446
Filing Date: 2003-07-22
Classification: C09B,C09D,G03F

Abstract:
A method of pigmenting color filters for liquid-crystal displays comprising pigmenting the color filters with a pigment 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 wherein R and Râ€² are independently OH, NH2, NHâ€”CN, acylamino, or arylamino, and R1 and R1â€² are independently â€”OH or â€”NH2â€², 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.