DE129494C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

Patents 88846 and 92708 depict certain secondary thiodisazo dyes described, which as a middle component the 2 · 5 - amidonaphtol-7-monosulfonic acid contain. The fact that these dyes are able to dye cotton directly is not surprising considering the thio derivative it contains.

It has now been found that other secondary disazo dyes not previously described which contain the said amidonaphthol sulfonic acid in the middle position, first Instead of those thio derivatives, substitute amines such as aniline, a-naphthylamine, etc. are not per se suitable for the representation of substantive dyes, unexpectedly have a great affinity for cotton fibers. This fact is all the more surprising, than in these dyes in contrast to the other previously known, Secondary disazo dyes that dye cotton do not have the two azo groups in ρ-position, but in 2-6-position to each other stand. '.. · ■■

These new dyes are obtained by using either the diazo compound of an otherwise Amine on 2-A, mido-5-naphthol-7-sulfonic acid, not suitable for the representation of substantive dyes in an alkaline solution, the resulting amidoazo compound can act further diazotized and now with any end component in a known manner combined, or by diazotizing the 2 - amido - 5 - naphthol - 7 - sulfonic acid and Coupling with any couplingable compound a monoazo dye represents, on which one then act the diazo compound of one of the amines mentioned running.

The dyes thus obtained vary, depending on the choice of components, from red to purple and black and are distinguished by their authenticity and intensity.

Examples: Example I.

The from 9.3 kg of diazotized aniline and 23.9 kg of 2-amido-5-naphthol-7-sulfonic acid in alkaline solution represented monoazo dyes with 7 kg of sodium nitrite in a known manner further diazotized and the resulting diazoazo compound, irrespective of whether it is direct or after isolation, in a soda-alkaline solution of 23.9 kg of 2-amido-5-naphthol-7-sulfonic acid let in. The dye thus formed and then isolated in the usual manner dyes cotton in shades of bordeaux of great clarity and lightfastness.

Example II.

23.9 kg of 2-amido-5-naphthol-7-sulfonic acid are converted into 7 kg of sodium nitrite and 25 kg Hydrochloric acid of 30 pCt. converted into the diazo compound and then with a solution of 23.9 kg of 2-amido-5-naphthol-7-sulfonic acid and 18 kg of soda combined. To the one thus obtained

Claims (1)

Monoazo dye is added to the diazo compound from 9.3 kg of aniline. The coupling kicks in one very quickly and smoothly and one obtains one in every respect with that described in Example I. Color identical product. Example III. 14.3 kg of a-naphthylamine are diazotized and immersed in the alkaline solution of 23.9 kg of 2-amido-5-naphthol-7-sulfonic acid let in. The resulting from the monoazo dye through Add 7 kg of sodium nitrite and acidify Diazoazo compound to be prepared with hydrochloric acid is filtered and then with the solution of the sodium salt of 22.3 kg of 1 «6-naphthylamine sulfonic acid united. After prolonged stirring and addition of sodium acetic acid the formation of the dye is complete. An alkaline reaction is then added sufficient amount of soda and isolate in the usual way. The dye stains cotton with blue-violet tones and can be further diazotized and developed in substance or on the fiber. Example IV. The amount of ι · 4-naphthylamine sulfonic acid corresponding to 7 kg of sodium nitrite is used in the usual way Way diazotized and in a soda-alkaline solution of 23.9 kg of 2x5-amidonaphthol-7-sulfonic acid let in. The monoazo dye thus formed is in a known manner with Converted into the diazoazo compound with the aid of 7 kg of sodium nitrite. The latter will isolated by filtration, then mixed with ice water to a paste, and dissolved in a solution of 14.3 kg of a-naphthylamine entered in the necessary amount of hydrochloric acid and about 24 hours touched. Careful addition of sodium acetate accelerates the coupling process. The diazo dye, which was finally converted into the sodium salt in the usual manner and then isolated dyes cotton in shades of reddish blue. He lets himself into substance and further diazotize and develop on the fiber. In the table below are the nuances of a number of those available through our process Dyes listed. , Dye from: dyes cotton: 0-toluidine 4-aniline 4 "
p-toluidine +
Aniline 4 "
p-phenetidine 4 ~
p-phenetidine -jp-xylidine 4-a-naphtylamine 4 "
a-naphtylamine 4-8-naphtylamine -ji · 4-naphthoic acid 4 "
p-phenetidine +
p-phenetidine 4 "
p-amidosalicylic acid 4 " al
ο -) - 2-Naphthylamine-8-sulfonic acid ■ + 2-naphthol-6-sulfonic acid + i-naphthol-4-sulfonic acid + 2-amido-5-naphthol-7-sulfonic acid. . . -f- 2-naphthylamine-6-sulfonic acid + 2-amido-5-naphthol-7-sulphonic acid. . . -j-i-naphthylamine-4-sulfonic acid -j- 2-amido-5-naphthol-7-sulfonic acid. . . -j- ι -naphthylamine-6-sulfonic acid 4- ι · 8-amidonaphtol-4-suIfosä'ure. . . -J- a-naphthylamine 4- p-Tolyl-i · 8-naphthylamine sulfonic acid 4- 2 x 8-amidonaphthol-6-sulfonic acid. . . 4- 2 x 8-amidonaphthol-6-sulfonic acid. . . red bluish red reddish burgundy bordeaux red-violet red-violet violet blue-violet blue-violet reddish blue reddish blue blue purple black blue black. Patent-A ν claim: Process for the preparation of secondary disazo dyes which directly dye cotton, which contain 2-amido-5-naphthol-7-sulfonic acid in the middle position, consisting in that those from the diazo compounds are otherwise not used to represent substantive dyes suitable amines and 2-amido-5-naphthol-7-sulfonic acid obtained in alkaline solution Monoazo dyes combined with azo dye components after further diazotization or to the 2-amido-5-naphthol-7-sulfo acid diazotized by combination with azo dye components obtained monoazo dyes • Diazo compounds not otherwise used for production suitable amines to act on substantive dyes.