Ciba-Geigy Corporation

Paul Erzinger

Carl Becker

Paolo Balliello

Arnulf Ruediger Lapple

Ernst Tempel

Georges Mahler

A preparation containing a mixture of dyes for dyeing polyacrylonitrile materials in navy blue to black shades, the dyeings obtained being distinguished in particular by a very good fastness to light.

Solid dye mixtures for dyeing polyacrylonitrile navy blue to black

Solid dye preparation of water soluble dyes with aliphatic

The invention describes a process for the preparation of formulations of metal complex dyes by means of a membrane separation process, which process comprises adding an anionic surfactant to the hot synthesis solution of over 50.degree. C. of the metal complex dye before, during or after the final step of the synthesis, and cooling the solution to a temperature not lower than 20.degree. C. before the membrane separation process. The formulations so obtained are suitable for the preparation of dyebaths, padding liquors or printing pastes which may be used in particular for dyeing and printing textile material made of natural and synthetic polyamide.

Process for the preparation of metal complex dye formulations using

The invention relates to novel aqueous dye preparations of dyes difficultly soluble in water, to processes for producing these dye preparations, to the use thereof for preparing printing pastes, and to the use of the said dye preparations for printing carrier materials for transfer printing, for printing in particular textile materials, or for dyeing textile materials, and also to the printed carrier materials, and to the material printed by means of these dye preparations in the transfer-printing process, or to the material dyed or printed in the dyeing or printing process. The novel dye preparations contain water, a finely dispersed dye of which the solubility in boiling perchloroethylene is lower than 0.5 g/kg, an anionic and/or nonionic dispersing agent, a resin which has affinity for the dye and which is more soluble than the dye in a solvent having limited miscibility with water, and optionally further additives.

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Liestal, Switzerland

Paul Erzinger