CH307184A - Process for the production of a copper-containing azo dye. - Google Patents

Description

  

      Additional patent to I main patent No. 290294. Process for the production of a copper-containing azo dye. The subject of the present patent is a process for the production of a copper-containing azo dye, which consists in adding 1.1 mol of the aminomonoazo compound of the composition
EMI0001.0008
    and 0.9 alol of the amino monoazo compound of the composition
EMI0001.0011
    advantageously in an aqueous medium and in the presence of an acid-binding agent,

   reacted with 1 mol of a fumaric acid dihalide and treated the disazo compound thus obtained with a copper donor.



  In the following example, the parts are parts by weight. Example: 65.9 parts of the aminomonoazo compound of the composition (I) and 34.8 parts of the aminomonoazo compound of the composition (II) are dissolved in 3000 parts of water with the addition of sodium carbonate.

   A 30% solution of pumaric acid dichloride in chlorobenzene is added dropwise to this solution with thorough stirring at a temperature of 8-10, until free amino groups can no longer be detected in it. The condensation solution is always kept neutral to slightly alkaline by occasionally adding solid sodium carbonate. After the reaction has ended, the disazo dye formed is deposited in the heat with the aid of sodium chloride and filtered off.



  To convert the compound into the copper complex, the dye is dissolved in 2000 parts of water at 70-80. After adding 50 parts of crystallized sodium acetate, the solution is mixed with enough parts of a 20% copper sulfate solution, with thorough stirring, until copper ions can be detected in the filtrate of a salted-out sample. The resulting copper complex compound is precipitated as the sodium salt with the aid of sodium chloride, filtered off and dried.



  The new copper-containing azo dye is a dark brown powder that dissolves in water and concentrated sulfuric acid with a red color and dyes cotton and fibers made of regenerated cellulose in yellow-brown shades of good lightfastness and washfastness. After-treating the dyeings with copper salts in the presence of a polyalkylene polyamine, their wet fastness properties are further improved.

 

Claims (1)

PATENT CLAIM: Process for the production of a copper-containing azo dye, characterized in that <B> 1.1 </B> mol of the aminomonoazo compound of the composition EMI0002.0018 and 0.9 moles of the amino monoazo compound of the composition EMI0002.0021 with 1 1V1ol of a fumaric acid dihalide and treated the disazo compound thus obtained with a copper donor. The new copper-containing azo dye is a dark brown powder that dissolves in water and concentrated sulfuric acid with a red color and dyes cotton and fibers made from regenerated cellulose in yellow-brown shades of good lightfastness and washfastness. By treating the dyeings with copper salts in the presence of a polyalkylene polyamine, their wet fastness properties are further improved. SUBClaims: I. Method according to claim, characterized in that the implementation is carried out in an aqueous medium. 2. Process according to claim, characterized in that the conversion is carried out in the presence of an acid-binding agent. 3. The method according to patent claim, characterized in that fumaric acid dichloride is selected as the fumaric acid dihalide. 4. The method according to claim and dependent claim 2, characterized in that sodium carbonate is selected as the acid-binding agent.