DE711328C - Process for the production of azo dyes on cellulose esters and ethers or fibrous materials containing them - Google Patents

Description

Process for the production of azo dyes on cellulose esters and - ethers or fibrous materials containing them It is known to have real dyeings To produce cellulose esters and ethers in such a way that organic bases, which contain a diazotizable amino group on the cellulose esters or ethers .Applies, diazotized on the fiber and treated with a coupling component, such as B. ß-naphthol, developed into azo dye.

It has now been found that washfast dyeings can be produced on cellulose esters and ethers can be achieved in a much simpler manner if one uses aminonaphthols or their core substitution compounds, e.g. B. containing alkyl groups or halogen atoms Substitution compounds, soft at least one free position capable of coupling contained in the naphthalene ring, applied to the cellulose ester or ether or in dissolves them, then diazotizes them and treats them with acid blunting or, alkaline agents cause self-coupling. The clutch can either by adding acid-dulling or alkaline agents to the diazotization bath after diazotization or by treatment with these agents in a special Bath can be achieved.

With the new process, there is no need to use a special coupling component. The aminonaphthol applied to the fiber acts simultaneously as a diazotization and coupling component. For the dyer there is a significant advantage that a coupling bath with a special coupling component, such as. B.; BN: aphthol, omitted. The process also allows fancy threads or nubs made of cellulose esters or ethers in woven fabrics or yarns or knitted wool, which can also contain rayon from regenerated celluloses in addition to wool, in dyeing processes using sulfonic acid group-containing self-coupling compounds, such as e.g. . in t>; e31 patents 692 193, 692 627 and patents 704111, 703440 and 710395 are described, at the same time washable to dye14, 1t1 proceeds in such a way that: ß m: äe dye baths with an aminonaphthol are common in these dyeing processes the specified composition in the form of an aqueous suspension or an alkali or acid salt, the aminonaphthol being drawn almost exclusively on the cellulose esters or ethers, then dianotized on the fibers and developed by coupling with itself.

The application of the aminonaphthols to the fiber can be both acidic as well as in neutral or alkaline solution. The dianotation is with the usual means. Inorganic Bases, alkaline, inorganic or organic salts or, alkaline reactive organic bases can be used.

Before the known process, in which mixtures of diazoamino -.- compounds and azo components are developed by the action of acid on acetate rayon, the present process has the advantage of simplicity, since only one component is used for dyeing, which is self-coupling after diazotization on the fiber is developed into the azo dye. Furthermore, the dyeings obtainable by the present process are significantly superior in terms of wet fastness to the dyeings obtained by known processes, in which acetate artificial silk dyes are applied to the fiber from aqueous suspension. Examples i.- Acetate rayon is at about 80 ° with 50, 'ö of the sodium salt of i-amino-6-oxynaphthalene, optionally in the presence of a protective colloid, for. B. Sulfitcelluloseabla.uge or Oleylmethyltaurin, about treated i hour, rinsed in the cold with 7.5 dianotiert 010 Natriumntrit 0.16 and 15 hydrochloric acid, and centrifuged in a cold bath comprising 8% ammonia solution, 25o; contains oig to a developed a black color, which is very fast to water and washing.

'''. 2. A mixed fabric of wool and cellular - ': wä11e made of viscose rayon, which contains knobs or effect fibers made of acetyl cellulose, is, as indicated in the patent 710395 , with 50,' o of the sodium salt of the azo dye 1- (4'-amino-2 '-chlorbenzolazo) -2-, amino-5-axynaphthalene-7-sulphonic acid, dissolved in water, and 80% ammonium sulphate pre-colored in a bath, which 0.80,' o with sulphite celluloseabl, eye finely divided i-amino-6 contains -ox3-naphthalene. - It is heated: to 85 °, held at this temperature for an hour, the bath is cooled with the addition of 600.0 Glauber's salt to about 70 ° and treated for about 1/1 hour. It is then rinsed, dianotized in the cold with 7.5011o sodium nitrite and 150110 hydrochloric acid with the addition of 500.16 Glauber’s salt for 1/2 hour, squeezed off and developed in the cold with 120.1% ammonia solution 250%. A black coloration is obtained , in which the acetyl cellulose effect fibers or knobs are also colored black.

The following list illustrates a number of other colors available in accordance with the present invention, for example on acetate cotton wool: Starting component Farmton i-Amino-6-oxynaphtb.alin black i-Amino-7-oxynaphth.alin dark brown i-Amino-3-oxynaphthalene orange brown i-Amino-8-oxynap "hth: alin violet brown 2-Amino-7-oxynaphthalene garnet red 2-Amino-5-oxynaphtbalin Granotrot.

Claims (1)

PAT1? NTANSPRUC1I: Process for the production of azo dyes on Cellulose esters and ethers or fibrous materials containing them, characterized in that that one aminonaphthols or their core substitution compounds, which at least contain a couplable free position in the naphthalene ring on the cellulose ester or -ether applies or dissolves in them, then dianotized and through a treatment causes self-coupling with acid-dulling or alkaline agents.