DE205216C - - Google Patents

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- Jig 205216 - CLASS 22 Ä GROUP

Dr. B. RASSOW in LEIPZIG. Process for the production of sulfur dyes. Patented in the German Empire on September 26, 1907.

Obtained by the action of sulfur sesquioxide on tetraalkyldiaminodiphenylmetrian one after the patent specification 65739 basic dyes, which according to the information of the patent specification and according to the investigations of Biehringer and Topaloff, Journ. f. pract. Chem. (2) 65, 501 ff., Are to be considered as thiopyronines and accordingly the following Formula. ■ ·

(AIk) ₂ N - C ₆ H ₃

C ₉ H ₉ = N (AIk) ₂ Cl

to have. If you use the disulfonic acid of diethyldibenzyldiaminodiphenylmethane for the same Κει 5 action, thus also a tetraalkyl diamino derivative, this is how the disulfonic acid is formed a thiopyronine, which is an acidic wool dye.

It has now been shown that completely different products are obtained if sulfur sesquioxide is used in sulfuric acid solution can act on the diaminodiphenylmethane itself, its homologues or derivatives and on the symmetrical disubstitution products of these bodies alkylated on nitrogen, in general to those compounds in which at least two amine hydrogen atoms of the diaminobdiphenylmethane or its derivatives are not substituted.

The dyes produced in this way

represent high-molecular, sulfur-rich, amorphous products that are used in all neutral agents Completely insoluble, but in concentrated sulfuric acid with a deep red color to solve; strong caustic soda absorbs it with partial decomposition. From alkaline sulfur solution they are easily solved with dirty green-blue paint; from these solutions draw the new dyes with dark green. Paint on unheated cotton; the coloring 'contributes. treatment with oxidizing agents Means such as B. water vapor and air or bichromate and acetic acid, in Bordeaux red until brick red around.

According to the new process, typical sulfur dyes are created which due to their nuance and the purity of the coloring from all previously known red sulfur dyes distinguish.

The dyes can be treated with alkali sulfur or alkali polysulphide afterwards, with an increase in the fastness properties can occur.

Example 1.

With constant stirring, add 0.4 parts of sulfur flowers to 15 parts of fuming sulfuric acid with an anhydride content of 25 percent and stir until the liquid has become completely homogeneous. Then add 1.5 parts of dry ^ - ^ - diaminodiphenylmethane in small portions and make sure that the mixture does not get over 40 ⁰ warm. The mixture is then stirred for a further 4 to 5 hours at ordinary temperature and the reaction mixture is then poured into 80 parts of cold water. Some of the dye separates out immediately; one boils until the smell of sulfur dioxide disappears, sucks off the dye and

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without drying it, puts it in the form of a paste of any concentration.

Example 2.

... Dissolve 1 part of sulfur in 20 parts of fuming sulfuric acid with 33 percent anhydride content and then ^{apply a solution of 2 parts of 3-3 1} -dichloro-4-4 ¹ -diaminodiphe-, nylmethane in 10 parts of sulfuric acid monohydrate, avoiding an increase in temperature over 40 ⁰ a; you can continue to proceed as in example 1.

Claims (1)

Patent claim: ■
Process for the preparation of sulfur dyes, consisting in treating diaminodiphenylmethane, its homologues or derivatives and those nitrogen-substituted derivatives of these compounds in which at least two hydrogen atoms of the amino groups are still unoccupied with sulfur sesquioxide and possibly on the products thus obtained alkali metal or alkali metal polysulphide can act.