CH301659A - Process for the preparation of a metal-containing azo dye. - Google Patents

Description

  

  Additional patent to main patent no. <B> 298511. </B> Process for the production of a metal-containing azo dye. It has been found that a new, valuable metal-containing azo dye is obtained by referring to the monoazo dye of the formula
EMI0001.0009
         lets cobalt-releasing agents act in such a way that an azo substance containing cobalt is formed,

    which contains two monoazo dye molecules bound to a 1- # obalt atom in a complex.



  The new dye forms a water-soluble powder that dyes wool from neutral to acetic acid baths in brown-yellow shades.



  The monoazo dye used as the starting material and corresponding to the above formula can be obtained by coupling the 1- (4-chloro-1) lietivi) -3-meth.v1-5-pyrazolone with all known methods, z. B. by means of hydrochloric acid and sodium nitrite, doped 2-amino-6-chloro-1 -oxybenzene- 4 <B> - </B> sulphonic acid amide.



  The treatment with the cobalt-releasing agents is carried out according to the present method in the manner that a cobalt-containing dye is distorted which contains less than one atom of cobalt in complex bonds per molecule of dye.

   Accordingly, the metallization is carried out in two ways with such cobalt- # -ib, cobalt-emitting agents and only those methods which, experience has shown, yield complex cobalt compounds of this composition.

   It generally recommends using less than one atom of cobalt per molecule of a paraffin and / or performing the metallization in a weakly acidic to alkaline medium. Cobalt salts such as cobalt sulfate or cobalt acetate are expediently used as cobalt-releasing agents, and if necessary also cobalt hydroxide precipitated by frisell.



  <I> Example: </I> 22.2 parts of 2-amino-6-chloro-1-oxybenzene-4-sulionsä-lireamide are added to <B> 50 </B> parts of water and 14 parts of 301% sodium hydroxide solution and after adding an aqueous solution of <B> 6.9 </B> parts of sodium nitrite to a mixture of <B> 28 </B> parts of <B> 30 </B> 1/9 strength hydrochloric acid and ice poured.

   The diazo suspension neutralized with sodium carbonate is converted into a solution of 21 parts of 1- (41-chlorophenvj-3-methyl-5-pyrazolone, 50 parts of Was Water and 14.0 parts of 301% sodium hydroxide solution are poured in. The coupling proceeds very rapidly. The dye is separated out by adding sodium chloride.



  4.07 parts of the dye obtained in this way are slurried as feueliter filter faucets in 100 parts of water and dissolved by adding 5 parts by volume of 2N sodium hydroxide solution and heating .

   The approximately <B> 800 </B> warm dye solution is mixed with <B> 1.5 </B> parts of crystallized sodium acetate and <B> 30 </B> parts of a <B> 70 "</B> warm cobalt sulphate solution with a cobalt content of 1.3%. The complex formation is over after a short time,

   and the cobalt compound of the dye can be deposited by adding sodium chloride and dilute acetic acid.

 

Claims (1)

<B> PATENT CLAIM: </B> Process for the production - of a metal-containing azolar material, dadiii - (- li marked that the monoazo dye of the formula EMI0002.0039 lets cobalt-releasing agents act in such a way that a cobalt-containing azo dye is formed, which contains two monoazo dye molecules bound to a cobalt atom in a complex. The new dye forms a water-soluble powder that dyes wool from neutral to acidic baths in brown-yellow tones. SUBClaims: <B> 1 .. </B> Method according to patent claim, characterized in that an amount of a cobalt-releasing agent containing less than one atom of cobalt is applied to a molecule of monoazo dye. 2. Process according to patent claim, characterized in that the metallization is carried out in an alkaline medium. <B> 3. </B> Process according to patent claim, characterized by the fact that simple cobalt salts are used as the cobalt-releasing agent.