| 摘要 |
Methine-azo compounds of the formulae <IMAGE> (I) <IMAGE> (Ia) in which A is the complement to a heterocyclic 5- or 6-membered ring which has a quaternized N atom as a ring member, which can contain further hetero atoms and which can be substituted and/or be fused with carbocyclic or heterocyclic rings, R is hydrogen, cyano or C2-C3-alkylene which is bonded to an N atom of ring A to form a 5- or 6-membered ring, B is substituted or unsubstituted phenylene or naphthylene, m and n independently of each other are the numbers 1 or 2, in the formula (I) at least one of the two symbols m and n being the number 2 and where in the case m=2 the two B's are identical or different, KK is the radical of a coupling component X(-) is an anion and Y is a bridge member. These compounds can be used for dyeing and printing in particular polyacrylonitrile, acid-modified polyester and especially paper.
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