Dyeing and printing textile materials made of cellulose fibers

Details Dyeing and printing textile materials made of cellulose fibers Dyeing and printing textile materials made of cellulose fibers

1995-02-06

1996-09-24

Einsmann, Margaret

Bleaching and dyeing; fluid treatment and chemical modification

Organic additive for dye composition, dye composition...

Ketone

8611, 8650, 8652, 8653, 8918, 8651, D06P 122, D06P 1651

Patent

active

055586775

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a process for dyeing and printing textile materials consisting of cellulose fibers or containing cellulose fibers in a blend with other fibers in an aqueous medium at above pH 12 with vattable dyes in the presence of at least one reducing agent for the vattable dyes and finishing the dyeing in a conventional manner.
EP-A-0 364 752 discloses a process for dyeing textile materials made of cellulose fibers with vat dyes in an alkaline medium, wherein the reducing agents used are mixtures of sodium dithionite and/or thiourea dioxide and .alpha.-hydroxycarbonyl compounds, such as hydroxyacetone, and the dyeing is carried out at a pH of not less than 13 and at temperatures above 75.degree. C. The dyeing is then finished in a conventional manner by oxidizing and washing the dyed material. The .alpha.-hydroxycarbonyl compounds described therein, such as hydroxyacetone, are not sufficiently stable under the dyeing conditions, being converted in an unpredictable manner into a multiplicity of products which inter alia lead to odor problems. The use of sodium dithionite and/or thiourea dioxide as reducing agents in the dyeing of cellulose fibers with vat dyes causes sulfite and sulfate ion pollution in the production waste waters of dyehouses.
It is an object of the present invention to provide a reducing agent for the above-described process which is stable in the strongly alkaline dyeing liquor, i.e. which does not condense to form colored products under the dyeing conditions and ideally causes no odor problems.
We have found that this object is achieved by a process for dyeing and printing textile materials consisting of cellulose fibers or containing cellulose fibers in a blend with other fibers in an aqueous medium at above pH 12 with vattable dyes in the presence of at least one reducing agent for the vattable dyes and finishing the dyeing in a conventional manner, wherein the reducing agents used are cyclic compounds which contain at least one instance of the structural unit ##STR2## in the ring of the molecule.
Surprisingly, cyclic .alpha.-hydroxyketones that contain structure I give a higher color yield than hydroxyacetone. A further decisive advantage over hydroxyacetone is that the cyclic .alpha.-hydroxyketones that contain structure I in the ring of the molecule do not develop a troublesome odor in dyeing and, owing to their stability in the alkaline pH range, do not turn the liquor brown.
The textile materials consist of cellulose fibers or contain cellulose fibers in a blend with other fibers. They can be in any state of processing, for example in the form of loose fiber, card sliver, yarn on package, yarn as hank, woven fabric or knitted fabric. The cellulose fibers can be either natural or regenerated cellulose, such as staple viscose, filament viscose or polynosics. The process of the invention can be used for dyeing not only mercerized cotton but also raw cotton and also raw yarn on package or as hank. Synthetic fibers present in the textile materials in a blend with the cellulose fibers are for example polyester fibers, polyacrylonitrile fibers or synthetic polyamide fibers.
The cellulose fibers are dyed with vattable dyes, such as vat dyes, in particular indigo, or sulfur dyes. The vat dyes are either indigo or anthraquinonoid or indigoid dyes. Vat dyes and sulfur dyes have long been commercially available and are documented in the Colour Index (C.I.); cf. Colour Index, 3rd edition 1971, Volume 3, pages 3719 to 3844, and Volume 4, C.I. Nos. 58000 to 74000, Soc. Dyers and Colourists, England.
The vattable dyes are used in the process of the invention in the amounts hitherto customary for dyeing, for example within the range from 0.01 to 10% by weight, based on the textile material. It is possible to use a single dye or a mixture of two or more vattable dyes. The dyeing of the textile materials can take place by the exhaust method, for example from a long aqueous liquor at a liquor ratio of from 5:1 to 40:1, preferably from 8:1 to 20:1, or else in a continuous process

REFERENCES:
patent: 3883249 (1975-05-01), Baumgarte et al.
patent: 4950306 (1990-08-01), Marte et al.

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