Patent ID: 7026459

Claim:
An azo dye of formula I wherein R 1 and R 2 are each independently of the other —NH—(CH 2 CH 2 )—OH, —NH—CH 2 —CHOH—CH 2 —OH, —NH—(CH 2 CH 2 )—S—(CH 2 CH 2 )—OH, —NH—(CH 2 CH 2 )—NH—(CH 2 CH 2 )—OH, —NH—(CH 2 CH 2 )—NH 2 , —NH—CH 2 —CHOH—CH 2 —NH 2 , —NH—CH 2 —CON(CH 2 CH 2 OH) 2 , —NH—CH 2 CH 2 —CON(CH 2 CH 2 OH) 2 , R 3 is —CN or —CONH 2 , R 4 is methyl or trifluoromethyl, R 5 is —CF 3 , —COOC 2 H 5 , R 6 is hydrogen or chlorine, and R 7 is hydrogen, chlorine, bromine or —NO 2 .