Anionic acid dyes, processes for their preperation and their use

An anionic acid dye of the formula ##STR68## in which R.sub.1 is hydrogen or C.sub.1 -C.sub.4 alkyl which is unsubstituted or substituted by hydroxyl, sulfo, sulfato, cyano or carboxyl, R.sub.2 is C.sub.1 -C.sub.4 alkyl,

• X.sub.1 is C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.7 cycloalkyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, or phenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.2 -C.sub.4 alkanoylamino, ureido, halogen or carboxyl, or naphthyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.2 -C.sub.4 alkanoylamino, ureido, halogen, carboxyl or sulfo, or the radical of the formula --N(R.sub.2)--X.sub.1 is a ring, which may contain further heteroatoms,
• Y.sub.1 is a radical of the formula ##STR69## in which B.sub.1 is C.sub.1 -C.sub.12 alkylene which can be interrupted by 1, 2 or 3 members from the group consisting of --NH--, --N(CH.sub.3)-- and --O-- and is unsubstituted or substituted by hydroxyl, sulfo, sulfato, cyano or carboxyl, or C.sub.5 -C.sub.7 cycloalkylene which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, phenylene, or naphthylene which are unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.2 C.sub.4 alkanoylamino, amino, hydroxyl, ureido, halogen, carboxyl or sulfo,
• R.sub.3 is hydrogen or C.sub.1 -C.sub.4 alkyl and R.sub.4 is hydrogen or C.sub.1 -C.sub.4 alkyl which is unsubstituted or substituted by hydroxyl, sulfo, sulfato, cyano or carboxyl,
• W.sub.1 is hydrogen or a radical of the formula --CO--R, in which
• R is C.sub.1 -C.sub.8 alkyl, or phenyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen, carboxyl or sulfo and
• A.sub.1 is the radical of a monoazo dye of the formula ##STR70## in which K.sub.1 is a radical of the benzene or naphthalene series or a heterocyclic radical and
• (R.sub.5).sub.0-3 is 0 to 3 identical or different substituents chosen from the group consisting of C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.2 -C.sub.4 alkanoylamino, ureido, halogen, carboxyl and sulfo, or
• A.sub.1 is the radical of a polyazo, metal complex azo, anthraquinone, formazan, phthalocyanine or dioxazine dye.