US2224280A - Production of dyeings and prints on textile material - Google Patents

Description

Patented n... 10, 1940 PRODUCTION OF DYEINGS AND PRINTS ON TEXTILE MATERIAL Ben Verity, Fall River, Mass, assignor, to the firm Durand & Huguenin A. G., Basel, Switzerland No Drawing. Application May 18, 1939, Serial No. 274,431. In Germany May 23., 1938 Claims.

is of duller greener tintas compared with the bright blue tint of the N-dihydro-1:2-2':1'-dianthraquinoneazine and is therefore tinctorially valueless.

This disadvantage is particularly noticeable when the so-called steaming processes are used for the development in which-the ester salt together with a suitable oxidizing agent, for instance sodium chlorate and an agent which yields sulphocyanide or diethyltartrate is printed on the material and the colour after-developed by steaming (see German specification No. 433,146 and U. S. Patent 1,747,107).

oxidizable so-called bufier substances is recommended; these allow the normal development of the dyeing but are more easily oxidizable than is the vat dyestufi developed so that any excess of oxidizing agent is taken up and the dyeing protected from over-oxidation. This process yields in very many cases good anduseful results. In the case of tetrasulphuric acid esters of the tetrahydro-1:2-2 1'-dianthraquinoneazine group, the process of U. S. Patent 1,779,305 is not unconditionally permissible. In spite of the useof large proportions of such buffer substances over-oxidation may occur.

In this connection attention must be called also to the process of German specification No. 591,410. In that specification the tint is developed from the tetrasulphuric acid ester without regard to over-oxidation and then the overoxidized tint is reduced to the normal shade by treatment with a reducing agent. This process however necessitates a further operation.

The present invention relates to a process in which a normal reliable development of the aforesaid tetrasulphuric acid ester salts is obtained by a short steaming owing to the presence in the printing paste of ammonium nitrate in addition to sodium chlorate. Ammonium nitrate acts in this case no doubt as an acid splitting agent, as an oxidizing agent and as a bufier substance. The certainty of the process which constitutes the acid under action of heat, for instance ammonium In the U. s. Patent No. 1,179,305 the use of a U posed oftechnical advance as compared with the known art is exhibited when the material has to be set aside for some time after the printing and before the steaming. Well developed normal tints are obtained by the process or the invention, while for example in using ammonium sulphocyanide instead of ammonium nitrate greenish dull tints are obtained.

It is to be mentioned that oxidizing catalysts, as for instance, vanadate of ammonia, which are 10 necessary in I the steam developing processes hitherto known (see U. S. Patent No. 1,779,305) are generally not needed in the present process.

The present invention is illustrated by the following examples. 1

Examples I and II For printing the following pastes can be used:

20 Examples of printing paste I II Sodium salt of the tetrasulphuric acid ester of tetrahydro-lz2-2 :1 -dianthraquinoneazine (20 per Parts Parts cent strength) 100 100 na 5 Sodium salt of dimethylaniline-parasulphonic acid. 30 Wnfr 200 Starch tragacanth thickening, neutral. 570 500 Ammonium nitrate solution (1:2) 90 90 Sodium chlorate solution (1:3) 60 60 Ammonia solution (25 per cent strength) 10 20 Example III 40 Cotton is padded with a padding liquor, com- I Parts Sodium salt of the tetrasulphuric acid ester of tetrahydro-1z2-2' l'z-dianthraquinoneazine (20 per cent strength) 10 Water 735 Tragacanth thickening 50 Sodium chlorate solution (of 33 per cent strength) Ammonium nitrate solution (of 50 per cent strength) Ammonia (25 per cent strength) 5 The material is dried, steamed for 8 minutes, washed, soaped at the boil, rinsed and dried.

In a similar manner derivatives of the tetrasulphuric acid ester of tetrahydro-1:2-2':1-dianthraquinone-azine, as for example tetrahydro- 3:3'- dichloro 1:2 2:1 dianthraquinoneazine, may be developed.

It is evident that the present process may be applied for the development of leuco ester salts of any other vat dyestufl which is sensitive or not sensitive to over-oxidation.

What I claim is:

1. In the production of dyeings and prints from dyestufls of the N-dihydro-l:2-2':1-dianthraquinone-azine group with the aid of leuco ester salts of these dyestuffs by acid oxidation, a process for obviating overoxidation, which comprises applying to the fibre a composition containing a tetrasulphuric acid ester of said group and a suitable oxidizing agent, and conducting the development of the dyeing by steam in presence of ammonium' nitrate, which furnishes the necessary acid in the heat and acts at the same time as buiier substance.

2. In the production of dyeings and prints from dyestuffs of the N-dihydro-l:2-2':1'-dianthraquinoneazine group with the aid of leuco ester salts of these dyestuffs by acid oxidation, process for obviating overoxidation, which comprises printing onto the fibre a composition containing a tetrasulphuric acid ester oi. said group and a suitable .oxidizing agent, and conducting the development of the dyeing by steam in presence of ammonium nitrate, which furnishes the necessary acid in the heat and acts at the same time as buffer substance.

3. In the production of dyeings and prints from dyestuffs of the N-dihydro-1:2-2':1-dianthraquirioneazine group with the aid of leuco ester salts of these dyestuffs by acid oxidation, a process for obviating overoxidation, which comprises applying to cotton a composition containing a tetrasulphuric acid ester of this group and a suitable oxidizing agent, and conducting the development of the dyeing by steam in presence of ammonium nitrate, which furnishes the nec essary acid in the heat and acts at the same time as bufler substance.

4. ,In the production of dyeings and prints from dyestufls of the N-dihydro-1:2-2':1-dianthraquinoneazine group with the aid of leuco ester salts of these dyestuffs by acid oxidation, a process for obviating overoxidation, which comprises applying to the fibre a composition containing a tetrasulphuric acid ester of this group and sodium chlorate, and conducting the development of the dyeing by steam in presence of ammonium nitrate, which furnishes the necessary acid in the heat and acts at the same time as bufier substance.

5. In the production oi. dyeings and prints from dyestuffs of the N-dihydro-l:2-2:1'-dianthraquinoneazine group with the aid of leuco ester salts of these dyestuffs by acid oxidation, a process for obviating overoxidation, which comprises applying to the fibre a composition containing the sodium salt of tetrahydro-1:2-2:1- dianthraquinoneazine and a suitable oxidizing agent, and conducting the development of the dyeing by steam in presence of ammonium nitrate, which furnishes the necessary acid in the heat and acts at the same time as bufi'er substance.

BEN VERI'I'Y.