| abstract |
The present invention provides water-soluble acid dyes of the formula (I)in whichR1, R2 and R3 independently of one another are A-X-COOM, A-X-SO3M, OR4 or NR5R6,A is NR7or S,X is a straight-chain or branched (C1-C16)-alkylene radical, a straight-chain or branched, hydroxyl-, carboxyl- or amino-substituted (C1-C16)-alkylene radical, an arylene radical or a hydroxyl-, carboxyl- or sulfo-substituted arylene radical;R4, R5, and R6 independently of one another are hydrogen or (C1-C4)-alkyl or are (C1-C4)-alkyl substituted by one or more hydroxyl, 2-hydroxyethoxy, (C1-C4)-alkoxy or amino groups,R7 is hydrogen, methyl or ethyl;M is a monovalent cation or one equivalent of a polyvalent cation, and which are suitable for printing natural and synthetic fiber materials for recording liquids, especially for the inkjet process, and for pulp-dyeing paper. |