Disazo dyes which contain 2-hydroxynaphthyl moiety

An azo dye of the formula ##STR154## wherein A is unsubstituted phenyl or naphthyl, or is phenyl or naphthyl, each of which is substituted by one or more of the substituents selected from the group consisting of C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkoxy, C.sub.2 -C.sub.8 alkanoylamino, C.sub.2 -C.sub.8 alkoxycarbonylamino, C.sub.2 -C.sub.8 alkanoyl, nitro, cyano, trifluoromethyl, chlorine, fluorine, bromine, carbamoyl, sulfamoyl, ureido, hydroxyl, carboxyl, sulfo, sulfato, unsubstituted phenylaminosulfonyl and naphthylaminosulfonyl, and phenylaminosulfonyl or naphthylaminosulfonyl, each of which is substituted by one or more of the substituents selected from the group consisting of C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkoxy, chlorine, fluorine, bromine, carboxy and sulfo;

• B is unsubstituted phenyl or is phenyl which is substituted by one or more of the substituents selected from the group consisting of C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, chlorine, fluorine, bromine, carboxyl and sulfo;
• and
• X is --N(R.sub.1)--SO.sub.2 --, --O--SO.sub.2 -- or --SO.sub.2 --N(R.sub.1)--, where R.sub.1 is hydrogen or C.sub.1 -C.sub.8 alkyl.