CH298751A - Process for the production of an acidic wool dye. - Google Patents

Description

  

  <B> Additional patent </B> to main patent no. 296669. Process for the production of an acidic wool dye. The subject of this patent is a process for the production of an acidic wool dye, which consists of

   that 1 mol of the compound obtainable by condensation of 1 mol of 4,4'-dichlorobenzophenone with 1 mol of N-methyl-2-phenylindole is reacted with 2 mol of 1-amino-4-oxybenzene-3-sulfonic acid.



  The seedlings are made by heating the starting materials with or without the addition of solvents or fluxes, e.g. B. with the addition of glycol or similar compounds. For example, temperatures from 110 to 160 ° C can be used. 1-Amino-4-oxybenzene-3-sulfonic acid is used as the free acid or in the form of its alkali or ammonium salts.



  The new dye dyes wool in very clear blue shades of good lightfastness and a beautiful evening color. It has good leveling properties, good drawability from acidic and neutral baths, and good fastness to sea water and perspiration.



  <I> Example: </I> 251 g of 4,4'-dichlorobenzophenone and 207 g of N-methyl-29-phenylindole are dissolved in 1800 cm3 of chlorobenzene at 70 ° C. and with the addition of 160 g of anhydrous zinc chloride and 306 g of phosphorus oxychloride 18 levels are reached at 120 Stirred up to 125 C.

   After cooling, the resulting red-brown crystals are filtered off with suction, washed with cold chlorobenzene and dried. The red condensation compound obtained in this way is strongly colored per se, but does not yet have any dye character; it is soluble in concentrated sulfuric acid with a deep red-brown color and in glacial acetic acid with a yellow-brown color.



  30 g of this compound are stirred with 100 g of .Glycol and 60 g of the sodium salt of 1-amino-4-oxybenzene-3-sulfonic acid and heated to 115 to 130 ° C. for 4 to 6 hours until the formation of dye no longer increases. When pouring into water, a blue dye separates, which is sucked off and cleaned by washing out with a little cold water.

   It is dissolved in warm water with the addition of a sufficient amount of sodium carbonate, the solution is filtered, 20 to 25 g of a dispersing agent are added, and the dye is then separated from the solution by salting out with sodium chloride. It is the sodium salt of a uniform disulfonic acid with the following composition.

      
EMI0002.0001
    The new dye dyes wool in very clear blue shades of good lightfastness and a beautiful evening color. Fr has good leveling power, good drawability from acidic and neutral baths, and good fastness to sea water and perspiration; Furthermore, it has practically no affinity for cotton fibers and therefore provides dyeings with pure cotton effects on blended fabrics made of wool and cotton.

 

Claims (1)

Claim: A process for the preparation of an acidic wool dye, characterized in that 1 mol of the compound obtainable by condensation of 1 mol of 4,4'-dichlorobenzophenone with 1 mol of N-methyl-2-phenylin, dol with 2 mol of 1-amino-4- oxybenzene-3-sulfonic acid sets. The new dye dyes wool in very clear blue shades of good lightfastness and a beautiful evening color. It has good leveling properties, good drawability from acidic and neutral baths, and good fastness to sea water and perspiration. SUBCLAIM: 1. Process according to patent claim, characterized in that the alkali metal or ammonium salt of 7th-amino-4-oxybenzene-3-sulfonic acid is used for the implementation. 2. Process according to patent claim, characterized in that the reaction is carried out by heating at 120 to 130 C. 3.- Process according to claim, characterized in that the implementation is carried out in the presence of glycol as a diluent.