Multi-component mixtures of bright red disperse azo dyestuffs

Details Multi-component mixtures of bright red disperse azo dyestuffs Multi-component mixtures of bright red disperse azo dyestuffs

1992-04-20

1993-05-04

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Dye or potential dye composition, additive, treatment,...

Mixed dyes, noncomplexed

8155, 8529, 8532, 8640, 8650, 8922, C09B 710, C09B 6722, D06P 118, D06P 384

Patent

active

052078043

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

The present invention relates to dyestuff preparations in the form of a multi-component mixture of bright red disperse azo dyestuffs and their use for dyeing synthetic fibers.
Dyeing of synthetic fiber materials with disperse dyestuffs by exhaustion from an aqueous medium using. HT dyeing conditions at temperatures between 105.degree. and 140.degree. C. is general prior art and is practiced on an industrial scale.
Disperse dyestuffs are by nature water-insoluble chemical compounds which contain no solubility-conferring grouping in the molecule. As organic color pigments, they are usually employed from an aqueous dispersion in colloidal form for dyeing hydrophobic synthetic fibers, such as, for example, 21/2 acetate, triacetate, polyamide or polyester fiber types, and for this purpose they first have to be brought into an absorbable, appropriately standardized fine dispersion by means of a so-called finish, advantageously under the co-influence of nonionic or anionic dispersing agents and, if appropriate, other auxiliaries. Without such a pre-treatment or such additives, it would not be possible to achieve a stain-free and even dyeing of the substrate.
However, as the expert in the field of operation mentioned knows, there are difficulties in the case of dyeing with bright red color shades inasmuch as on the one hand the number of single dyestuffs having the desired shading capacity is very limited, and in addition all the individual dyestuffs suitable for this purpose have the disadvantage that when used for high temperature dyeing of wound packages, that is to say chiefly for cheeses and warp beams, under critical conditions--even with the best possible finish--they often tend towards filtration and therefore to dyeings which are not fast to rubbing. The build-up of such single dyestuffs in the heating-up phase, which is critical for the result of the dyeings, is also usually too slow and therefore unsatisfactory because for this reason dyeing temperatures which extend to the upper limit of the tolerance for the dyestuff and fiber and long dyeing times always become necessary.
The coloring agents in question on the basis of the inadequacies discussed in respect of the dyeing results which can be achieved are, above all, the disperse dyestuffs of the type C.I. Disperse Red 200, C.I. Disperse Red 151 and the like.
In view of the state of affairs described above, the object was thus to develop bright red disperse dyestuffs having faultless process characteristics in respect of dyeing properties, build-up and dispersion stability for the production of standard and combination dyeings on synthetic fibers by the exhaustion technique under high temperature (HT) conditions, and of realizing this aim using high-performance combinations based on two or three specifically selected red disperse dyestuffs. The aspect that filtration of non-fixed dyestuff on the goods must be avoided without fail was also essential, especially in view of the use of the coloring agents in question in the dyeing of wound packages.
According to the invention, the solution to the object aimed at/by the expert has now been found in that the disadvantages mentioned for red single dyestuffs of the abovementioned type in HT exhaustion dyeing of, in particular. PES fibers can be avoided by planned use of a combination of the azo compounds described below.
The present invention accordingly relates to dyestuff preparations in the form of a multi-component mixture of red disperse azo dyestuffs, which consist of dyestuff of the formula I ##STR1## and 20 to 80 parts by weight, preferably 25 to 70 parts by weight, of the dyestuff of the formula II ##STR2## and, as the shading component, 0 to 20 parts by weight, preferably 5 to 15 parts by weight, of the dyestuff C.I. Vat Red 41 having the C.I. No. 73300 and corresponding to the formula III ##STR3## or contain these dyestuffs, with the proviso that the sum of the proportions of the single dyestuffs on which the mixture is based in each case makes up a total weight of the preparation of 10

REFERENCES:
patent: 4115055 (1978-09-01), Kirner et al.
patent: 4231918 (1980-11-01), Babler
patent: 4620853 (1986-11-01), Tappe et al.

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