CH203430A - Process for the preparation of a dye of the anthraquinone series. - Google Patents

Description

  

  Process for the preparation of a dye of the anthraquinone series. It has been found that a valuable, new dye of the anthraquinone series is obtained if anthraquinone derivatives of the general structure are used
EMI0001.0007
    where X and Y are interchangeable residues that allow the conversion of the anthraquinone derivatives into their leuco compounds, such as. B.

   OH, O-alkyl or NH2, partly in the form of their leuco compounds, with a mixture of amino-2,3-propanediol and aminoethanol. The end product thus obtained is, since it is partly in the form of its leuco compound, subsequently oxidized.



  Starting materials are, for example, 1,4-dioxyanthraquinone, 1,4-diaminoanthraquinone, 1-amino-4-oxyanthraquinone, 1-amino-4-methoxyanthraquinone, 1-Ogy-4-methoxyanthraquinone and 1,4- Dimethogyanthraquinone.



  In many cases it is not necessary to start from the finished leuco compounds, but the anthraciinone derivatives can also be used in the presence of a reducing agent such as zinc dust or sodium hydrosulfite.



  The end product thus obtained provides colorations of high clarity and good fastness on cellulose esters and ethers. A particular advantage is its good solubility in water, so that dyeing from an aqueous bath often does not require the addition of dispersing or wetting agents or other dyeing auxiliaries.



  <I> Example: </I> A mixture of 24 parts of 1,4-dioxy-anthraquinone, 6 parts of leuco-1,4-dioxy-anthraquinone and 160 parts of isobutanol is mixed with a mixture of 13.6 at 60 ° C. while stirring Parts of 1-amino-2,3-propanediol and 9.2 parts of aminoethanol are added.

   The mixture is first stirred for 2 hours at 60 C, then heated to the boil and boiled while stirring and refluxing until no more 1,4-dioxyanthraquinone can be detected in a sample. In order to oxidize small amounts of leuco compounds, air is passed through the mixture and isobutanol is removed from it by means of steam, with the majority of the resulting compound dissolving with a blue color.



  After adding animal charcoal, small amounts of undissolved fractions are filtered off and the resulting substance is salted out from the deep blue mother liquor after adding a little sodium hydroxide solution with common salt. It consists of a mixture of mainly 1-propanediol - amino -4 - äthanola.minoanthraquinone and a little 1,4-Dipropa.ndi.olaminoanthraehinone, while the water-insoluble 1,4-di- (Ethanolamino) anthraquinone is separated off as a water-insoluble fraction by filtering the aqueous solution.



  The blue dye thus obtained dissolves in sulfuric acid with a bluish red color. In warm water it dissolves with a deep blue color and, on cellulose ethers and esters, provides strong blue colorations of excellent fastness.

 

Claims (1)

PATENT CLAIM: Process for the production of a new dye of the anthraquinone series, characterized in that anthraquinone is derived from L): e from the general structure EMI0002.0032 where X and Y mean exchangeable residues which allow the conversion of the anthraquinone derivatives into their leuco compounds, partly in the form of their leuco compounds, with a mixture of amino 2, 3-propanediol and aminoethanol converts, and existing leuco compounds oxy dated. The new dye is a mixture of 1.-Propanediol -amino-4-Ethanolaminoanthraquinone and 1,4-Dipropanediola.minoanthraquinone. It dissolves in sulfuric acid with a bluish red color. It is soluble in warm water with a deep blue color and, on cellulose esters and ethers, provides strong blue colorations of excellent fastness.