Improvements relating to the Manufacture of Colouring Matters.
Year: 1898

page_text: Date of Application, 10th Dec., 1898
Complete Specification Left, 21st July, 1899-Accepted, 26th Aug., 1899
PROVISIONAL SPECIFICATION.
Improvements relating to the Manufacture of Colouring Matters.
I, HENRI RAYMOND VIDAL, of 95, Boulevard Beaumarchais, Paris, in the
Republic of France, Chemical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to the production of a thio-derivative of toluene for
dyeing cotton direct.
Benzol-azo-para-cresol, when heated in the presence of sulphur and soda or
of sodium sulphide and sulphur, becomes reduced, and thereupon yields a
reddish-violet colouring agent which ultimately changes to a dark blackish
brown colouring matter.
In order to obtain this colouring matter I heat the following mixture in
an oil bath, within a cast iron vessel or chamber fitted with stirring mechanism;
viz.——
Caustic soda
Sulphur
Benzol-azo-para-cresol
-
40 Kilogrammes.
8
"
30
"
These I first heat to a temperature of from 180° to 190° Centigrade. After
distilling the aniline liberated in the course of the reaction I progressively
raise the temperature to 240° Centigrade: which temperature I keep up for
from 6 to 8 hours. The product thus obtained will be in the form of a brittle
black substance soluble in water, which (when dissolved therein) will turn
a dark violet; while under the action of acids it will yield a dark precipitate.
It dyes cotton direct, imparting to it some very rich dark brown shades nécessi-
tating no oxidation.
T
101 1
1900
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements relating to the Manufacture of Colouring Mattersį
I, HENRI RAYMOND VIDAL, of 95, Boulevard Beaumarchais, Paris, in the
Republic of France. Chemical Engineer, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention relates to the production of a thio derivative of toluene for
dyeing cotton direct.

page_text: Benzol-azo-para-cresol, when heated in the presence of sulphur and soda or
of sodium sulphide and sulphur, becomes reduced, and thereupon yields
reddish-violet colouring agent which ultimately changes to a dark blackish
brown colouring matter.
In order to obtain this colouring matter I heat the following mixture in
an oil bath, within a cast iron vessel or chamber fitted with stirring mechanism;
reddish-violet colouring agent which ultimately changes to a dark blackish
brown colouring matter.
In order to obtain this colouring matter I heat the following mixture in
an oil bath, within a cast iron vessel or chamber fitted with stirring mechanism;
Caustic soda
Sulphur
Benzol-azo-para-cresol
40 Kilogrammes,
8
"
30°
"1
These I first heat to a temperature of from 180° to 190° Centigrade. After
distilling the aniline liberated in the course of the reaction I progressively
raise the temperature to 240° Centigrade; which temperature I keep up for
from 6 to 8 hours. The product thus obtained will be in the form of a brittle
black substance soluble in water, which (when dissolved therein) will turn
a dark violet; while under the action of acids it will yield a dark precipitate.
It dyes cotton direct, imparting to it some very rich dark brown shades necessi❤
tating no oxidation.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. The preparation of dark brown colouring, agents for direct dyeing, consist-
ing in heating the benzol-azo-para-cresol with sulphur and soda or with sodium
sulphide and sulphur.
2. The product obtained by the process described in Claim 1.
3. The application of the product obtained by the process described in Claim 1
to dyeing and printing.
D
1
011
0
L
1000
HASELTINE. LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.