DE645568C - Process for the production of Kuepen dyes - Google Patents

Description

Process for the production of vat dyes A process for the production of vat dyes is protected by the patent 645 oio, in which one is made from compounds of the general structure where A and A 'denote identical or different radicals of anthraquinones, in which Leweils the two bonds shown emanate from adjacent positions, and X and Y can denote oxygen, sulfur or an NN group, but at least one of the two is an NN group must be, splits off hydrogen halide. Some of the dyeings obtainable with these dyes are not washfast enough for all purposes.

It has now been found that dyes are obtained which are excellently alkaline and provide washfast colorations if one of the available according to the patent 645 oio Dyes treated with alkylating agents. As alkylating agents come for example Arylsulfonsäurealkylester, alkyl sulfates and alkyl halides into consideration.

The new dyes can, if desired, by treating with hypochlorite getting cleaned. Example i One carries 10 parts of the example i of the patent 6,000 available dye in a heated to 200 ° mixture of 100 parts Trichlorobenzene and 20 parts of anhydrous potassium carbonate and so long p-toluenesulfonic acid methyl ester in small proportions until a sample taken after several hours of boiling is out the vat a yellow, which no longer changes to brown when dabbed with alkali Cotton dye supplies. The dye is then sucked off at between 120 and 150 ° Alcohol and water washed and dried. He dyes cotton from a bluish-tinted red color Vat in strong, real yellow tones.

The same dye can be made by using dimethyl sulfate or Methyl chloride used as an alkylating agent.

Similar dyes are obtained if methyl p-toluene-sulfonate is used instead other alkyl esters of p-toluenesulfonic acid, e.g. B. the ethyl or chloroethyl ester, used.

Example a In a mixture of 10 parts trichlorobenzene and 20 parts Potassium carbonate is carried at 2oo ° 10 parts of that according to Example 2 of Patent 645 ° available dye, are 2o parts of p = Toluolsulfonsättreäthylester and heats the mixture to the Simmer until the color of one Sample on cotton with Alkälietx_ no longer turns over. Then you work up in the manner described in example i and, if necessary, rhyme the dye approximately by dealing with \ atriumüvpochlorit. He fä cotton from the blue-red vat in alkaline Uli washfast greenish yellow tones. Example 3 io parts of the example 4 of the patent 645,000 available dye is carried into a heated to 200 ° Mixture of 100 parts of trichlorobenzene and 2o parts of potassium carbonate. gives 2o Allocate p = methyl toluenesulfonate and heat the mixture for several hours long to simmer. Then the dye is sucked off at about 140 ° and washed with it Alcohol and hot water bits. It can be treated with sodium Tiy @ pochlorit getting cleaned. He colors tree @ i-olle from a violet vat in bright yellow tones and has very good fastness properties.

Claims (1)

PATENT APPLICATION: Process for the production of vat dyes, characterized in that the dyes obtainable according to patent 645 oio treated with alkylating agents.