DE853155C - Process for dyeing cellulose esters or these products with a similar color behavior - Google Patents

Description

Process for dyeing or dyeing cellulose esters products with similar behavior It is known that when dyeing cellulose esterii, z. B. from rayon and rayon, from low fatty acid esters of cellulose, such as cellulose butyrate, cellulose propionate and especially cellulose acetate, as well as from corresponding Mixed esters are advantageously used in some cases with mixtures of dyes. Dye mixtures are here among others. also indicated when the mixture of dyes is not used Achieving a specifically desired shade is intended, but when the two The dyes to be mixed produce the same or very similar shades because in in many cases the mixture provides a stronger shade than the individual mixing components in pure form. This so-called mixing effect varies in strength from case to case. Naturally, it already occurs when in the production of a uniform Dye by-products are created that remain in the finished dye. Particularly pronounced mixing effects, d. H. those in which the resulting mixed coloring is quite significantly stronger than that with the stronger coloring mixed component alone achievable colorations are rare. In addition, there is an increased purity of staining Naturally, it is not achieved through the use of mixtures, but is in some Cases, as to be expected, with a more or less pronounced turbidity of the mixed color to be expected.

It has now been found that the dyeings on cellulose esters are surprisingly good can be produced if one uses mixtures for dyeing that act as coloring agents Component in the main Just i- (ß'-oxyethyl) -amino-4-phenylaminoanthraquinone and i-methylamino-4-phenylaminoanthraquinone in finely divided form.

The cellulose esters known in the introduction can be used as the cellulose esters to be colored mentioned esters of cellulose with low molecular weight aliphatic acids are used will. In some respects, they are to be equated with the cellulose esters in terms of color similarly behaving fibers made from some cellulose ethers and super polyamides, Super-polyurethanes and super-polyesters.

The individual mixed components i- (ß-oxyethyl) -amino-4-phenylaminoanthraquinone and i-methylamino-4-phenylaminoanthraquinone are known per se and can be in various Way to be made. It is convenient to use them for making the present To use dyeings in a pure or relatively pure state. You can In a manner known per se, the dyeing process is preceded in a finely divided state , for example by grinding with dispersants, such as sulphite cellulose waste liquor, expediently after previous reprecipitation, for example from sulfuric acid.

The mixture of the two components can be done before or during the preparation of the Dye bath take place. The mixing ratio can vary within fairly wide limits, however, it is advisable to also use the component in a smaller amount is present, not less than 20%, preferably 25 to 50%, of the amount of dye to use.

The dyeing can be carried out in a conventional manner, for example in an aqueous manner Dispersion, with the addition of wetting or dispersing agents such as soap, N-benzyl-i-heptadecylbenzimidazole sulfonic acids, Taurine or methyltaunine condensation products of fatty acids and the like.

It is also advantageous to produce a dye preparation that both above-mentioned components in the desired mixing ratio and finely dispersed Condition contains and furthermore wetting agents or dispersants, such as sulphite cellulose waste liquor, may have.

The following examples illustrate the present invention without somehow restrict their content. The parts mean parts by weight that Percentages by weight and temperatures are given in degrees Celsius. Example i 4 parts of i- (β-oxyethyl) -amino-4-phenylaminoanthraquinone and 4 parts of i-methylamino-4-phenylaminoanthraquinone are dissolved together in 5o parts of 650/0 sulfuric acid. This solution is on a mixture of 160 parts of ice, 24o parts of water and 55 parts of 250/0 ammonia discharged, stirred well and filtered off. The filter residue is washed neutral and with about 12 parts of dried sulphite cellulose waste liquor and the necessary amount Grind water to a dye paste containing about 10% dye mixture.

The paste obtained in this way gives blue colorations on acetate rayon of great purity. It allows the production of dark blue tones, like them with the individual mixing components not at all or only when used extraordinarily much larger amounts of dye and cannot be obtained in the same purity. Example 2 In Example 1, 6 parts of i- (β-oxyethyl) amino-4-phenylaminoanthraquinone are used instead of 4 parts and instead of 4 parts 2 parts of i-methylamino-4-phenylaminoanthraquinone, similar ones are obtained Results which almost approach the good results according to example i.

Similar results are obtained when using 2 parts of i- (ß-Oxyätlivl) -ainino-4-phenylaminoanthraquinone and 6 parts of i-methylamino-4-phenylaminoanthraquinone. Example 3 io parts of a 100% Paste of finely divided ß (-Oxyäthyl) -amino-4-lihenylaininoaiithraquinone and 10 parts of a 100% paste of i-methylamino-4-phenylaminoantlirachinon carries one in a solution of 6 parts of the sodium salt of N-benzyl-t-heptadecylbenzimidazole disulfonic acid in zoo parts of water at 30 ° and gives 3,000 parts of water at 40 ° under good Stir too. 100 parts of well-wetted acetate rayon are entered at 40.degree the temperature rises to 80 ° within 1 / q hour and colors at this temperature for 1 hour. The acetate rayon is then rinsed and finished as usual. You get a deep blue color of great purity. Example 4 Proceed as in Example 13 indicated, but used 2o parts of a prepared according to Example i or 2 Dye paste with 10% content of dye mixture and is practically very similar Results.

Claims (3)

PATENT CLAIMS: i. Process for dyeing cellulose esters or products which behave similarly in terms of color, characterized in that dye mixtures are used in a finely divided state, the main coloring constituents being i - (ß-oxyethyl) - amino-4-phenylaminoanthraquinone and i-methylamino-4 -phenylaminoanthraquinone contain. 2. The method according to claim i, characterized in that the mixing ratio of the two components is between 1: 4 and 4: 1. 3. The method according to claims i and 2, characterized by using roughly equal parts of the components.