CH254809A - Process for the production of a lively acidic milled dye of the anthraquinone series. - Google Patents

Description

  

  Process for the production of a lively acidic milled dye of the anthraquinone series. It is known from Swiss patent no. 242,846 that when one uses anthracbinon fibers of the general formula
EMI0001.0009
    where x and y mean alkyl radicals and where the arylamino radical can be further substituted, treated with ha.logging agents,

   Dyes with excellent washing, fulling and light fastness properties and very good drawability can be obtained from neutral baths.



  The present invention relates to a process for the production of acidic dyes of the anthraquinone series, which are also distinguished by particularly good wash, swell and light fastness properties, but only really get absorbed on wool in a sulfuric acid bath. They are also characterized by the great vividness of the hue.

    -The process for the preparation of these new dyes is characterized in that, ss znan on anthraquinone derivatives of the general formula
EMI0001.0030
         where x is halogen or: a sulfo group, y alkyl radicals, where the arylamino radical can still be substituted by alkyl or halogen, and a z is a sulfo group, the other z are hydrogen atoms, halogenating agents, eg. B.

   Chlorine, bromine,: sulfuryl chloride and bromide, can act. The halogenation. is preferably carried out in sulfuric acid of various concentrations, sulfuric acid monohydrate or dilute oleum and in the presence or absence of halogen carriers such as iodine, iron salts, etc., at temperatures from 0 to 40, whereby the temperature can be increased to 40 to 80 at the end.



  In cases where x in the general formula denotes chlorine or bromine, this two-position halogen atom is also replaced by the sulfo group in the customary manner by means of alkali metal sulfite.



  Starting products suitable for halogenation are, for example: 1-amino-4- (2 ', 6' - dimethyl - anilido) - anthraquinone-2,5-, 2,6-, 2,7- and 2,8-disulfonic acid , 1-Amino-4- (2 ', 4', 6 '- trimethyl-anilido) -anthraquinone-2, 5-, 2,6-, 2,7- and 2,8-disulfonic acid, 1-amino-4 - (2 ', 3', 6'-trimethyl-anilido) -anthraquinone-2,5-,

            2,6-, 2,7- and 2,8-disulfonic acid, 1-amino-4- (2 ', 6' - dimethyl \ - 3 '(4') - chloro-anilido) -anthra- ehinon-2, 5-, 2,6-, 2,7- and 2,8-disulfonic acids; Homologous groups, e.g. ethyl, can take the place of methyl groups.

   Instead of the free sulfonic acids, their alkali salts can also be used as starting materials.



  The present patent relates to a process for the production of a new acidic milled fiber of the anthraquinone series, wel Ches is characterized in that 1-amino-4- (2 ', 6'-dimethylanilido) -anthraquinone-2,6-disulfonic acid Lets bromine act.



       Example: 5.8 parts of 1-amino-4 - (2 '; 6'-dimethylanilido) -anthraquinone-2,6-disulphonic acid potassium are dissolved in 50 parts of 90% sulfuric acid at room temperature with stirring by adding 50 parts. 1.8 parts of bromine are then added dropwise, and the mixture is stirred overnight at 20 to 30; if necessary, increase the temperature to 60 for a further 3 hours.

   The brominated dye is worked up in the usual way, be it by pouring the sulfuric acid solution into ice and water or by fractional precipitation of the acid sulfuric acid salt from the sulfuric acid solution by adding a little water.



  The dye is obtained in red needle-like blue needles, which easily dissolve in water with a bright green blue color. The color of the solution in conc. Sulfuric acid is dirty, red and blue; with the addition of a little paraformaldehyde, it turns bright red: tinged blue.

   The dye dyes animal fibers such as wool. , Silk, etc., as well as artificial fibers, e.g. B. Superpolyamide fibers, in bright blue tones of excellent authenticity properties: It has the formula
EMI0002.0070


 

Claims (1)

PATENT CLAIM: A process for the production of a new acidic fulling dye of the anthraquinone series, characterized in that bromine is acted on 1-amino-4- (2 '; 6'-dimethylanilido) -anthraquinone-2 "6-disulfonic acid The dye consists of red-tinged blue needles that dissolve easily in water with a bright green-tinged * blue color. The color of the solution in conc. Sulfuric acid is dirty, red, blue; if a little paraformaldehyde is added, it changes to a bright, red-tinged blue. The dye dyes animal fibers such as wool, silk, etc., as well as artificial fibers, e.g. B. super polyamide fibers, in bright blue tones with excellent fastness properties. He owns the formula EMI0002.0091