DE269215C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

Vl 269215 CLASS 22 δ. GROUP

R.WEDEKIND & CO. m. b. H. in UERDINGEN. Process for the preparation of real vat dyes. Patented in the German Empire on December 19, 1912.

In the patent 265647 a bromine-containing yellow vat dye has been described which by heating dibromo-2-oxyanthraquinone with the addition of soda. It has It has now been found that the body is not only an excellent dye in itself, but at the same time represents an excellent dye former. The body is able with amine canthraquinones as well as with primary aromatic amino compounds To enter condensation products. There was no evidence of the behavior of the used halogen derivatives against aromatic amines before, it could, since the existing ones Halogen atoms are probably in the ß-position, cannot be foreseen, whether a reaction would occur at all, and what kind of reaction products, if any would be. The products obtained are delivered from an alkaline vat Cotton real and fiery dyes; the washing, soap, acid, chlorine and light fastness the colorations are surprising. It is represented by condensation of the components in nitrobenzene or naphthalene on the addition of sodium acetate and copper powder and working up the melt in the usual way. For example, after the Cooling off the reaction mixture, separate the crystallizing portion for itself, from distill off the solvent with steam from the filtrate, then the residue with Wash alcohol, water, dilute sodium hydroxide solution, dilute hydrochloric acid, or you can distill the solvent is removed directly with steam and then the entire residue is treated as you can read above. For the purpose of representing the condensation products, the It is not necessary to clean the yellow dye with chlorine. It's best to go directly from the dried, alkali-insoluble crude product.

Example 1.

5.2 parts of bromine-containing vat yellow from patent 265647, 4.5 parts of I-aminoanthraquinone, 0.4 part of copper powder, 5 parts of dehydrated sodium acetate are obtained in 100 parts of nitrobenzene for 5 to 7 hours at the boil. After cooling with Al _is: alcohol are added, the separated precipitate is filtered off, washed with alcohol and water and dried. Dark, orange-brown powder, insoluble in alcohol. The solution in concentrated sulfuric acid is gray-blue, from which orange-brown flakes fall into water.

Example 2.

5.2 parts of bromine-containing vat yellow of patent 265647, 4.5 parts of 2-aminoanthraquinone. Otherwise as in Example 1. Dark brown powder, insoluble in alcohol. The solution in concentrated sulfuric acid is gray-reddish, from which water falls dark brown flakes.

65 Example 3.

5.2 parts of bromine vat yellow of Patent 265647, 4.8 parts of 1 x 5-diaminoanthraquinone. Otherwise as in Example 1. Brown-red powder, insoluble in alcohol. The Lö-

Claims (1)

The solution in concentrated sulfuric acid is gray-violet, from which water is brown-red flakes falls. Example 4. 5.2 parts of bromine vat yellow of patent 265647, 2.2 parts of p-toluidine. Furthermore as in Example 1. Dark brown powder, insoluble in alcohol. The solution in concentrated Sulfuric acid is brown-red, from which water falls olive-brown flakes. The properties of the dyes can be seen from the table below: 10 condensation product
/ with Solution in conc.
sulfuric acid Vat Shade of coloring / ■, ■
I-aminoanthraquinone
/ 2-aminoanthraquinone
ι · 5-diaminoanthraquinone
p-toluidine dark purple '
brown purple
blue-violet
brown purple brownish red
Brown
brownish red
Brown brown orange
yellow-brown
copper
light yellow olive Pate ν τ-An SPRU c H. Method for the representation of real vat dyes, characterized in that the yellow bromine-containing dye of patent 265647 with primary aromatic Amines is condensed.