Patent ID: 6211346
Filing Date: 2001-04-03
Classification: C09B

Abstract:
A process for preparing a metal complex composition exhibiting a dispersing harshness less than 250 and comprising(a) at least one metal complex of an azo compound conforming to the formula (I) ##STR13##or a tautomeric form thereof,whereinrings X and Y independently are optionally substituted with one or two substituents selected from the group consisting of .dbd.O, .dbd.S, .dbd.NR.sub.7, --NR.sub.6 H.sub.7, --OR.sub.6, --SR.sub.6, --COOR.sub.6, --CN, --CONR.sub.6 R.sub.7, --SO.sub.2 R.sub.8, ##STR14##alkyl, cycloalkyl, aryl, and aralkyl,the dotted lines in each of the rings X and Y optionally represent one or two double bonds such that the total number of endocyclic and exocyclic double bonds is three for each of the rings X and Y,R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently hydrogen, alkyl, cycloalkyl, aryl, or aralkyl, or R.sub.1 and R.sub.2 together and/or R.sub.3 and R.sub.4 together form 5- or 6-membered rings, as indicated by the broken lines, to which further rings are optionally fused,m, n, o, and p are 1 when the corresponding ring nitrogen atom is not part of a double bond or are zero when the corresponding ring nitrogen atom is part of a double bond, as indicated by the dotted lines,R.sub.5 is --OH, --NR.sub.6 R.sub.7, alkyl, cycloalkyl, aryl, or aralkyl,R.sub.6 is hydrogen, alkyl, cycloalkyl, aryl, or aralkyl,R.sub.7 is hydrogen, cyano, alkyl, cycloalkyl, aryl, aralkyl, or acyl,R.sub.8 is alkyl, cycloalkyl, aryl or aralkyl,with the proviso that R.sub.1 to R.sub.8 are optionally further substituted by replacing the hydrogen atom of a CH group, and(b) at least one guest compound, said process comprising(1) preparing a metal complex of an azo compound conforming to the formula (I) in the presence of water and, optionally, an organic solvent at a pH of .ltoreq.2,(2) forming an intermediate educt of the metal complex of the azo compound and at least one guest compound, wherein said educt is characterized by exhibiting a dispersing harshness greater than 250, at a pH of 1 to 7,(3) heating the educt at a temperature of 80 to 180.degree. C., with the proviso that if the heating step is carried out at a pH of <4, the heated educt is subsequently adjusted to a pH of >4.5,(4) optionally additionally heating the educt, either in suspension or as an isolated solid, at a temperature of 80 to 180.degree. C. at a pH of 1 to 4 or pH 9 to 13, and(5) collecting the resultant metal complex composition.