2,6-Diaminopyridine-based azo dyes for cellulose-containing fibers

Abstract

Diaminopyridine-based azo dyes for cellulose-containing fibers, represented by the following formula: ##STR1## and the other is hydrogen, phenyl, benzyl, allyl, or alkyl which are unsubstituted or substituted by hydroxyl or lower alkoxy (wherein A is methylene, ethylene, propylene, or 1,3-butylene; n is 0 or 1; Y.sup.1 and Y.sup.2, which are the same or different, are hydrogen, alkyl, alkenyl, cyclohexyl, aryl, or aralkyl which are unsubstituted or substituted by cyano, hydroxy, lower alkoxy, or dialkylamino, or Y.sup.1 and Y.sup.2 together form a 5- or 6-membered heterocyclic ring (NY.sup.1 Y.sup.2) containing one nitrogen, the total number of carbon atoms of Y.sup.1 and Y.sup.2 being 18 or less; R.sup.1 is nitro, cyano, methylsulfonyl, phenylsulfonyl, mono-lower alkylaminosulfonyl, di-lower alkylaminosulfonyl, acetyl, or benzoyl; R.sup.2 and R.sup.3, which are the same or different, are hydrogen, trifluoromethyl, halogen, or cyano; R.sup.4 is hydrogen, lower alkyl, mono- or di-lower alkylaminosulfonyl, mono/or di-lower alkylcarbamoyl, or acetylamino; R.sup.5 and R.sup.6, which are the same or different, are hydrogen, halogen, or lower alkyl; R.sup.7 is lower alkyl; R.sup.8 is trifluoromethyl, or halogen; and R.sup.9 is hydrogen, or halogen). The dyes are useful for dyeing cellulose-containing fibers, particularly cellulose fibers and mixed fibers of polyester fibers and cellulose fibers in from orange to blue.

Dependencies are inferred from the claim text.