US 5,207,804 A · Multi-component mixtures of bright red disperse azo dyestuffs

Abstract

Coupling products of diazotized o- or p-toluidines to 3-hydroxy-2-naphthoic acid p-anisidide do not produce optimum dyeing properties in HT exhaustion dyeing of wound packages of synthetic fiber materials. Filtration occurs time after time under critical conditions, since these single dyestuffs and also mixtures of these with one another build up too slowly in the heating-up phase. A bright red multi-component system of the same color shade, which exhibits a significantly improved exhaustion capacity by synergism during HT dyeing of wound packages and no longer presents difficulties in respect of filtration, can be obtained by mixing monoazo dyestuffs which are obtained by coupling diazotized aniline and p-toluidine in each case to 3-hydroxy-2-naphthoic acid p-anisidide.

Claims10

Dependent claims

A dyestuff preparation in the form of a multi-component mixture comprising red disperse azo dyestuffs, which comprises

80 to 20 parts by weight, of the dyestuff of the formula I ##STR4## and 20to 80 parts by weight, of the dyestuff of the formula II ##STR5## and, as the shading component, 0to 20 parts by weight, of the dyestuff C.I. Vat Red 41 having the C.I. No. 73300 and corresponding to the formula III ##STR6## with the proviso that the sum of the proportions of the individual dyestuffs on which the mixture is based in each case makes up a total weight of the preparation of 100 parts by weight and is based on the content of pure dyestuff.

Dependencies are inferred from the claim text.

Multi-component mixtures of bright red disperse azo dyestuffs

Life of this patent

Multi-component mixtures of bright red disperse azo dyestuffs

Life of this patent

Abstract

Claims10