CH267878A - Process for the preparation of an acidic dye of the anthraquinone series. - Google Patents

Description

  

      Additional patent to main patent No. 263286. Process for the production of an acidic dye of the anthraquinone series. It has been found that new anthraquinone dyes can be prepared by using anthraquinone compounds of the general formula
EMI0001.0007
    wherein X is halogen or sulfo, Y is halogen and Z is hydrogen or sulfo, with aromatic amines of the general formula
EMI0001.0012
    where R is an aryl nucleus and R,

      Denotes hydrogen or alkyl, condensed, and when X denotes a halogen atom, this is replaced by a sulfo group in a customary manner.



  The dyes obtained in this way dye ani malic fibers in blue tones, which have good light and wet elicity and differ from the dyes according to the sehweiz. Patent selirift no. 150808 and the U.S.A. patent no. 1927125 differ particularly through a greatly increased flexing fastness.



  To produce these dyes, the aroylated aromatic amino compounds, for example, o-, in-, p-benzoylamino-aniline; o-, m-, p- (o'-chlorobenzoyl-methylamino) - anhin; o-, m-, p- (p'-toluylethylamino) aniline; o-, m-, p- (m'-phenyl-benzoyl-butyl-amino) -m-, -p-, -o-toluidine; o-, m-, p-Benzoylamino-in, -p-, -o-ehloraniline and many others are used.



  The present patent relates to a process for the production of a new acidic dye of the anthraquinone series and is characterized in that 1-amino-4-bromo-anthraquinone-2-sulfonic acid sodium is condensed with m-aminobenzanilide.



  In the following example, parts mean parts by weight.



  <I> Example: </I> 20.2 parts of 1-amino-4-bromo-anthraquinone-2-sulfonic acid sodium, 15.9 parts of m-aminobenzanilide, 8 parts of sodium bicarbonate, 0.4 part of copper bronze, 60 parts Ethanol and 120 parts of water are heated to 700 for three hours while stirring.



  The condensation mass, which has turned blue, is worked up in the usual way and, after drying, delivers a blue dye powder that dissolves in warm water to give a clear blue color. The color of the solution in concentrated sulfuric acid is light blue-green; if a little paraformaldehyde is added, it changes to deep grass green. The new dye dyes wool, silk and other animal fibers as well as artificial fibers such as. B. Nylon, in beautiful blue tones. The dyeings are of good lightfastness, very good fastness to washing and perspiration and good fastness to milled.

 

Claims (1)

Claim: Process for the preparation of an acidic dye of the anthraquinone series, characterized in that 1-amino-4-bromo-anthraquinone-2-sulfonic acid sodium is condensed with m-aminobenzanilide. The dye is a blue powder that dissolves clear blue in warm water. The color of the solution in concentrated sulfuric acid is light blue-green; with the addition of a little paraformaldehyde, a change to deep grass-green occurs. The new dye dyes wool, silk and other animal fibers as well as artificial fibers such as E. Nylon, in beautiful blue tones. The dyeings are of good lightfastness, very good washability and perspiration and good millfastness. He owns. the formula. EMI0002.0012