Navy blue water-soluble sulfophenyl- or sulfonaphthyl-azo-1,4- phenylene- azo-5-(8-anilinonaphthalene-1-sulfonic acid) dyes for polyamides

摘要

Water-soluble dyes of the structure ##STR1## wherein D is a benzene group or a naphthylene group,PPA is H, Cl, Br, lower alkyl, or lower alkoxyPPB is H, lower alkyl, or lower alkoxy,PPB.sub.1 is lower alkyl or lower alkoxy, P PR is H, Cl, Br, lower alkyl, or lower alkoxy, andP PM and M.sub.1 are H, Na, K, NH.sub.4, or Li.PP The dyes have good affinity for natural and synthetic polyamide fibers, including wool, silk and nylon, which they dye from neutral or weakly acid dye baths in strong navy blue shades with good fastness properties. These dyes are also valuable in combination with certain orange dyes to produce black shades on polyamide fibers that possess good fastness properties.