Patent ID: 6028179
Filing Date: 2000-02-22
Classification: C09B

Abstract:
A trisazo dye of the general formula I ##STR37## where R.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl, halogen, nitro, hydroxysulfonyl, sulfamoyl, mono- or di-C.sub.1 -C.sub.4 -alkylsulfamoyl, C.sub.1 -C.sub.4 -alkylsulfonyl or C.sub.1 -C.sub.4 -alkoxysulfonyl,R.sup.2 is hydrogen, halogen, nitro or hydroxysulfonyl, at least one of R.sup.1 and R.sup.2 being nitro,R.sup.3 and R.sup.4 are each independently of the other hydroxyl or amino,R.sup.5 is hydrogen, C.sub.1 -C.sub.4 -alkyl, hydroxysulfonyl, sulfamoyl, mono- or di-C.sub.1 -C.sub.4 -alkylsulfamoyl, C.sub.1 -C.sub.4 -alkylsulfonyl, C.sub.1 -C.sub.4 -alkoxysulfonyl or carboxyl,R.sup.6 is hydrogen or C.sub.1 -C.sub.4 -alkyl,R.sup.7 is hydrogen, hydroxysulfonyl, sulfamoyl, mono- or di-C.sub.1 -C.sub.4 -alkylsulfamoyl, C.sub.1 -C.sub.4 -alkylsulfonyl, C.sub.1 -C.sub.4 -alkoxysulfonyl, SO.sub.2 N(CH.sub.2 COOH).sub.2 or carboxyl,R.sup.8 is hydrogen, hydroxyl, C.sub.1 -C.sub.4 -alkoxy, halogen or nitro,with the proviso that at least one of R.sup.5 and R.sup.7 is COOH or SO.sub.3 H and when R.sup.5 or R.sup.7 is SO.sub.3 H the other is COOH, or R.sup.3 and/or R.sup.4 are each amino or R.sup.1 is hydrogen or R.sup.6 is alkyl,in free form or in the form of a metal salt or as a transition metal complex.