CH296001A - Process for the preparation of a vinyl sulfone dye. - Google Patents

Description

  

  Process for the preparation of a vinyl sulfone dye. 1: s it was found that valuable dyes suitable for dyeing and printing natural and synthetic fibers are obtained. If the atomic grouping -S02-CR = CH .., where R is hydrogen, is added to the molecule of acidic dyes or their preproducts , a low molecular hydrocarbon radical or halogen be means, one or more times.

      Acid dyes that contain the primordial black horse -S02-CR = CH2 once or several times can belong to different dye classes. For example, they can come from the series of azo dyes, nitro dyes, anthraquinone dyes, triphenyl methane dyes, etc. The production of the starting materials can be carried out in various ways. You can z.

   B. an acidic dye or a Vorpro product, converted into the sulfinic acid or its sodium salt and bring to reaction with ss-Chlorätllylalkohol or Ät.hylenoxyd or their homologues. From the (6-oxeth @ -lsulfones obtainable in this way) the compounds of the group --S02-CR = CH2 can be prepared in the usual way and these, if they are uni preliminary products, with reactive components, which may be acidic Group may contain agree.

   Compounds of the present type can also be obtained by subjecting compounds with the group -S-CR = CH2 or -SO-CR = CH2 to oxidation. Finally, neutral dyes containing a vinyl sulfone group can also be used as a starting point and sulfonated.



  The dyes have a special affinity for wool, silk, acetate silk, animalized rayon, polyamide fibers; however, they can also be used to advantage, depending on the structure of the underlying dye molecules, for dyeing cotton, rayon or other. Fibers of vegetable origin are used.

   Because of the very reactive vinyl sulfone group, the dyes can react with reactive groups on the fiber material. They can also be polymerized on the fiber. or by reaction with compounds that can react with vinyl sulfone groups, condensed further.

         In this way, llan receives dyeings and prints with excellent fastness properties.



       The subject of the present patent is a process for the preparation of a vinyl sulfone dye, which is characterized in that the diazonium compound from 1-aminophenyl-2-vinyl sulfone in an acidic medium with 2 amino-8-oxynaphtha-Iin-6- sulfonic acid couples. Example:

       A solution of 55.2 parts by weight of 1-aminophenyl-2- ”inylisolphone in 300 parts by volume of glacial acetic acid is allowed to slowly flow into a mixture of 186 parts by weight of nitrosyl sulfuric acid 20.5% and 360 parts by weight of glacial acetic acid, the temperature being 15 G can rise.

   After stirring for about two hours at 15 C, it is poured. man: put the solution on ice and destroy any free nitrous acid with sulfamic acid. 77.7 parts by weight of 2-amino-8-oxynaphthalene-6-sulfonic acid 92.1 a / oig, dissolved in 720 parts by volume of water and 300 parts by volume of n-sodium hydroxide solution, are now allowed to flow into the clear diazo solution at: 5 to 10 ° C. .

   After the coupling is complete, the vinyl sulfone dye has the following formula:
EMI0002.0020
    Salted out with common salt, suctioned off, washed neutral with common salt solution and dried.



  The product obtained in this way is a dark red powder which dyes wool in lively blue-tinged red tones with its own special properties. '

 

Claims (1)

PATENT CLAIM Process for the production of a vinyl sulfone dye, characterized. that the diazoniumverbindungen from l-aminopheny 1. \ 2-v inylstilfon in acidic medium with. 2-Amino-8-oxyna.phtialine-6-sulfonic acid couples. The product thus obtained is a dark red powder which dyes wool in lively blue-tinged red tones with good fastness properties.