Ciba Specialty Chemicals Corporation

Sandra Weiss

Michael Lennartz

Adolf Käser

Dölf Käser

The present invention relates to novel yellow anionic dyes, a process for their preparation, certain novel intermediates necessary for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper. The dyes are of formula (14), (15) or (16) in which

Yellow anionic disazo dyes

The present invention relates to novel yellow anionic dyes, a process for their preparation, certain novel intermediates necessary for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper.

Anionic monoazo dyes of the formula (1) in which A represents 1- or 2-naphthyl residue, which is substituted by a total of one or two sulphonic and/or carboxylic acid groups. Rrepresents hydrogen or C-Calkyl, each Dand D, independently of the other, represent either an amino acid residue resulting from removal of a hydrogen atom from the amino group of the amino acid or the residue &#x2014;NRR, in which each Rand R, independently of the other, represent hydrogen, C-Calkyl, C-Calkyl which is substituted by hydroxy, halogen or cyano, phenyl which is unsubstituted or monosubstituted by hydroxy, halogen, SOH, C-Calkyl or C-Calkoxy or alternatively, Rand R, together with the nitrogen atom to which they are connected, complete a saturated 5- or 6-membered ring which may contain, in addition to the nitrogen atom, one nitrogen or oxygen atom and which may be further substituted and n is 0 or 1, a process for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper 

Anionic monoazo dyes

The present invention relates to novel yellow anionic dyes, a process for their preparation, certain novel intermediates for their preparation and the use of these dyes for dyeing natural or synthetic materials, in particular, paper.

The present invention relates to novel compounds of the formulae A, D, D, Rand n are as defined in the description the compounds being in an internal or external salt form, or mixtures of compounds (1) and (2), a process for their preparation and preparations containing them used for dyeing paper.

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Lörrach-Brombach, Germany

Sandra Weiss