Patent number: 4263229
Abstract: Compounds of the formula ##STR1## homogeneous and heterogeneous metal complexes thereof, and mixtures of said compounds and complexes, whereineach A is independently hydroxy or amino,T is carboxy or sulpho,T.sub.1 is hydrogen, nitro, halo, alkyl, substituted alkyl, alkoxy, substituted alkoxy or sulpho,T.sub.2 is hydrogen, nitro, halo, alkyl, substituted alkyl, alkoxy or substituted alkoxy,X is hydrogen, hydroxy, halo, nitro, alkyl, substituted alkyl, alkoxy, substituted alkoxy or sulpho, andY is hydrogen, hydroxy, halo, nitro, alkyl, substituted alkyl, alkoxy, substituted alkoxy or ##STR2## wherein with the proviso that Y is-- ##STR3## when X is other than sulpho, Z is hydrogen, carboxy or a sulpho,Z.sub.1 is hydrogen, hydroxy, nitro, alkyl, substituted alkyl, alkoxy, or substituted alkoxy, andZ.sub.2 is hydrogen or nitro.These dyes are useful for dyeing leather.
Type:
Grant
Filed:
December 9, 1974
Date of Patent:
April 21, 1981
Inventors:
Martin Studer, Heinz Wicki