Manufacture of a Red-brown Dyestuff Containing Sulphur Directly Dyeing Cotton.
Year: 1899

page_text: Date of Application, 5th May, 1899
PROVISIONAL SPECIFICATION.
Manufacture of a Red-brown Dyestuff Containing Sulphur Directly
Dyeing Cotton.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in
the County of London, Chartered Patent Agent, do hereby declare the nature
of this invention (as communicated to me from abroad by The Farbwerke
vormals, Meister Lucius & Brüning, of Hoechst a/Main, in the Empire of
Germany, Chemical Manufacturers), to be as follows:-
A red-brown dyestuff directly dyeing cotton may be obtained, if trinitro-para-
amidodiphenylamine be melted with sulphur and an alkali sulphide.
The primary material is obtained by the action of chlorodinitrobenzene
(1 chloro. 2: 4-dinitro) upon nitro-para-phenylenediamine, and it is best to
operate in an aqueous alcoholic solution in the presence of agents capable of
combining with hydrochloric acid, such as acetates. The product, thus obtained,
is in form of a brick-red powder, insoluble in water and alcohol, soluble with
difficulty in xylene; the compound crystallises from hot acetic acid in red-brown
laminæ. From this compound the new dyestuff is obtained as illustrated by
the following example:-
10 kilos. of trinitro-para-amidodiphenylamine are heated on the oil bath with
15 kilos. of sulphur and 30 kilos. of sodium sulphide in an aqueous solution for
several hours from 160°-170° C. (as indicated by the thermometer in the oil
bath). The rest of the water is then evaporated and the dry dyestuff is heated
at about 130° C. until it dissolves in water with a violet colour like indamine.
The powder thus obtained is easily soluble in water and may be directly
employed for dyeing purposes; it dyes cotton red-brown shades.
11000
'ABEL & IMRAY,
Agents for the Applicant.
Manufacture of a Red-brown Dyestuff Containing Sulphur Directly
Dyeing Cotton.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in
the County of London, Chartered Patent Agent, do hereby declare the nature
of this invention (as communicated to me from abroad by The Farbwerke
vormals, Meister Lucius & Brüning, of Hoechst a/Main, in the Empire of
Germany, Chemical Manufacturers), and in what manner the same is to be

page_text: performed, to be particularly described and ascertained in and by the following
statement:-
A red-brown dyestuff directly dyeing cotton may be obtained, if trinitro-para-
amidodiphenylamine be melted with sulphur and an alkali sulphide.
The primary material is obtained by the action of chlorodinitrobenzene
(1 chloro. 2: 4-dinitro) upon nitro-para-phenylenediamine, and it is best to
operate in an aqueous alcoholic solution in the presence of agents capable of
combining with hydrochloric acid; such as acetates. The product, thus obtained,
is in form of a brick-red powder, insoluble in water and alcohol, soluble with
difficulty in xylene; the compound crystallises from hot acetic acid in red-brown
laminæ. From this compound the new dyestuff is obtained as illustrated by
the following example:-
10 kilos. of trinitro-para-amidodiphenylamine are heated on the oil bath with
15 kilos. of sulphur and 30 kilos. of sodium sulphide in an aqueous solution for
several hours from 160°-170° C. (as indicated by the tliermometer in the oil
bath). The rest of the water is then evaporated and the dry product is heated
at about 130° C. until it dissolves in water with a violet colour like indamine.
The powder thus obtained is easily soluble in water and may be directly
employed for dyeing purposes; it dyes cotton red-brown shades.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim is:-
1. The herein described manufacture of a dyestuff directly dyeing cotton red-
brown, by heating with sulphur and an alkali sulphide trinitroamidodiphenyl-
amine obtained by combining dinitrochlorbénzene with nitro-para-phenylene-
diamine.
2. The dyestuff manufactured as above set forth.