Patent ID: 7255737

Claim:
A pigment formulation comprising: a) at least one metal complex of an azo compound which in the form of its tautomeric structures conforms to the formula (I) where the X and Y rings independently bear one or two substituents selected from the group consisting of ═O, ═S, ═NR 7 , —NR 6 H 7 , —OR 6 , —SR 6 , —COOR 6 , —CN, —CONR 6 R 7 , —SO 2 R 8 , alkyl, cycloalkyl, aryl and aralkyl wherein each of the X and Y rings have a sum total of three endo- and exocyclic double bonds, R 6 represents hydrogen, alkyl, cycloalkyl, aryl or aralkyl, R 7 represents hydrogen, cyano, alkyl, cycloalkyl, aryl, aralkyl or acyl, R 8 represents alkyl, cycloalkyl, aryl or aralkyl, R 1 , R 2 , R 3 , R 4 independently represent hydrogen, alkyl, cycloalkyl, aryl or aralkyl and, as indicated by the broken lines in the formula (I), may combine to form 5- or 6-membered rings to which further rings may be fused, R 5 represents —OH, —NR 6 R 7 , alkyl, cycloalkyl, aryl or aralkyl, wherein the R 1 to R 8 substituents, optionally, contain substituted CH bonds and m, n, o, p denote 1 or zero when double bonds emanate from the ring-nitrogen atoms, and which metal complexes intercalate with at least one other compound, b) an iron compound other than component a) having an iron content of less than 30 ppm, based on component a), and c) at least one metal compound having a metal that is in each case different than that of the metal of components a) and b) and having a metal content of at least 10 ppm, based on component a), the metal being selected from the group consisting of alkali metals Li, Na and K, alkaline earth metals Mg, Ca and Ba, lanthanoids La, Ce, Pr and Nd and also Al, Sc, Ti, V, Cr, Mn, Co, Cu, Ni and Zn.