Tetrakisazo compounds having a 1-hydroxy-2-(4'-(2'-sulfoanilino) phenylazo) -3,6-disulfo-7-(optionally 2'-substituted phenylazo)-8- aminonaphthalene middle component

摘要

Compounds of the formula ##STR1## in which X signifies hydrogen, halogen or --SO.sub.3 M,PPM signifies hydrogen or a non- chromophoric cation, andPPK.sub.1 and K.sub.2, which are the same or different, each signifies a coupling component which has at least one free amino, enolic hydroxy or phenolic hydroxy group,P PAnd mixtures thereof, are useful as anionic dyes for natural and regenerated cellulose, natural and synthetic polyamides, polyurethanes, basically modified polyolefins, paper and, particularly, leather. The dyes are well-soluble in water, resistant to acid, have relatively low substantivity on leather, produce level dyeings and have no hardening effect on chrome-tanned leather and exhibit good fastness to light and wet treatments on paper. Also disclosed are compounds of the formula ##STR2## wherein M and X are as defined above, which are useful as intermediates.