The use of metal-free sulfo group free basic disazo compounds containing two identical 6-hydroxypyrid-2-one coupling component radicals for producing colored paper

摘要

Metal-free compounds of the formula and 1:1 and 1:2 metal complexes thereof and acid addition salts of such metal-free compounds and 1:1 and 1:2 metal complexes, wherein each B is -A1-NR7R8 or -A1-(+)NR7R8R9A(-), the two B's being identical, wherein each A1 is linear or branched C2-8alkylene, each R1 is hydrogen, C1-4alkyl, C5-6cycloalkyl, phenyl, benzyl or phenylethyl, the two R1's being identical, each R2 is independently halo, hydroxy, nitro, carboxy, C1-4alkyl or C1-4alkoxy, each T is hydrogen, cyano, -COOR4, -CON(R5)2, -SO2N(R5)2, the two T's being identical, wherein each R3 is independently hydrogen, C1-4alkyl, -N(R5)2 or -CON(R5)2, each R4 is C1-6alkyl or phenyl(C1-3alkyl), each R6 is C1-4alkyl, and each Xa is -O-, -S- or -NR5-, and Xo is a direct bond or an organic bridging radical, wherein each R5 is independently hydrogen or C1-4alkyl, or -N(R5)2 is an unsubstituted saturated ring containing 1 to 3 hetero atoms or a saturated ring containing 1 to 3 hetero atoms and substituted by 1 to 3 C1-4alkyl groups, each A(-) is a non-chromophoric anion, and R7-R9 are organic radicals, are useful as dye for paper, textiles and leather.