Patent ID: 7416593

Claim:
A dyestuff according to the formula (I), a salt of the dyestuff, or a mixture of the dyestuffs wherein R 1 , R 2 , R 3 , R 4 , independently from each other is H, SO 3 H, SO 2 R, SO 2 NR′R″, COOR, COOH, OH, alkyl, aryl, alkoxy, NCOCH 3 , or NR′R″, or two neighbouring substituents R 1 , R 2 , R 3 , or R 4 form together a ring annealed to the benzthiazole moiety and is unsubstituted or substituted by SO 3 H and wherein at least two of the substituents R 1 , R 2 , R 3 , or R 4 are H; R 5 , R 6 , R 7 , R 8 , R 9 independently from each other is H, alkyl, aryl, alkoxy, SO 3 H, NR′R″, or two neighbouring substituents R 5 , R 6 , R 7 , R 8 , or R 9 form together a ring annealed to the phenyl moiety and is unsubstituted or substituted by SO 3 H and wherein at least two of the substituents R 5 , R 6 , R 7 , R 8 , or R 9 are H; R is H, alkyl or aryl group, substituted or unsubstituted, R′ and R″ are independently from each other H, alkyl or alkoxy or aryl groups, substituted or unsubstituted; with the proviso that at least one of the substituents R 5 , R 6 , R 7 , R 8 , or R 9 is different from H, and the compound according to the formula (I) bears at least one sulpho group, which is located in the coupling component.