CH259729A - Process for the production of a vat dye. - Google Patents

Description

  

  Additional patent to main patent no. 243843. Process for the production of a vat dye. It has been found that a valuable Kilpenfarb.:toff can be obtained by adding 1 mole of a functional derivative of an anthraquinone - 2;

  6 - diearb-o.nsäure, which contains an exchangeable substituent in each of the 1- and 5- position, with 2 moles of 1- amino-5-benzoylaminoanthraehinone and then the substituents in the 1- and 5- position of the acid component through Treat 1unb with a sulfonic acid amide and split off the

      Sulfonsä.ureesters give amino groups exchanges.



  The new dye is a red-brown powder, which dissolves in concentrated sulfuric acid with a red color and dyes cotton from a black-olive vat in bluish red-brown tones.



       Substituents that can be exchanged for an amino group are, for example, halogen atoms. As sulfonic acid amide, for example, p-toluenesulfonamide can be used.



  The acid chloride, for example, can be used as the functional derivative of the acid component to carry out the reaction with the amino components. The reaction is expediently carried out in an indifferent solvent or distribution medium, particularly those with a higher boiling point such as chlorobenzene, nitrobenzene or dichlorobenzene. The reaction can be carried out, for example, at elevated temperature, in the presence or absence of acid-binding agents.

    <I> Example: </I> 18.8 parts 1,5 - Dichloranfhraühinon - 2,6- dicarbon: acid, obtained by oxidation of 1,5 - Di-chloro - 2,6 - dimethylanthra, quinone with manganese dioxide in 8 'O per cent sulfuric acid at 80 is converted into the acid chloride by heating with 20 parts of thionyl chloride in 750 parts of troek @ enem o dichlorobenzene.

    After the unused thionyl chloride has been distilled off, a hot solution of 34.2 parts of 1-A.mino.5 benizoylaminoanthraehinone in 35.0 parts of o-dichlorobenzene is allowed to flow in at 150.

   After stirring for two hours, it is at 15.0 to 1-610. the dye formation ends. It is suctioned off in the heat, washed with diehlorhenzene and alcohol and dried.



       2.5.3 parts of the product obtained in this way with 1-0.3 parts of p-toluenesulfamide, 5.8 parts of potassium aeeta.t and 0.6 parts of copper acetate in 200 parts of dry nitrobenzene during 7 hours with stirring to the heated.

   After it has cooled down, it is filtered, treated with: alcohol, dilute hydrochloric acid and water and thrown out. To split off the toluenesulphonic acid groups: the reaction product obtained in this way is introduced into 500 parts of concentrated sulfuric acid and stirred for 5 hours at 2.10. The red colored solution is now poured onto ice, the precipitated dye is filtered off, washed out with water and dried.

 

Claims (1)

PATENT CLAIM: Process for the production of a vat dye, characterized in that 1 1VZol of a functional derivative of an anthraquinone-2,6-dicarboxylic acid which contains an exchangeable substituent in the 1- and 5-positions, @ -with 21 1VIol 1-amino-5-benzoylaminoanthraquinone .reaetzt and then the Aubstltu entere in 1- and. & Position .the acid component is exchanged for amino groups by treatment with a sulfonic acid amide and subsequent cleavage of the sulfonic acid residue. The new dye is a red-brown powder that dissolves in concentrated sulfuric acid with a red color and dyes cotton from a shear arzoliver vat in blue-tinged red-brown tones.