Manufacture of a Brown Dyestuff directly dyeing Cotton.
Year: 1899

page_text: Date of Application, 7th Apr., 1899
Complete Specification Left, 8th Dec., 1899-Accepted, 13th Jan., 1900
PROVISIONAL SPECIFICATION.
Manufacture of a Brown Dyestuff directly dyeing Cotton.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Buildings, in
the County of London, Consulting Engineer and Chartered Patent Agent, do hereby
declare the nature of this invention (as communicated to me from abroad' by Actien-
Gesellschaft für Anilin Fabrikation, of Berlin, in the Empire of Germany, Chemical
Manufacturers,) to be as follows:-
It has been stated that by heating with sulphur and sulphides of alkali metals
certain derivatives of the benzene and naphthalene series, among others amido-
naphtholsulphonic acids, black dyestuffs directly dyeing cotton are obtained.
It has also been stated that if amido-oxysulphonic acids of the benzene series are
melted together with sulphur and sulphides of alkali metals colouring matters are
formed which likewise directly dye cotton. These dyestuffs however do not yield
black but green or olive green shades.
.
My foreign correspondents have now found that if, instead of the amidophenol-
sulphonic acids, amidocresolsulphonic acid, the constitution of which is represented
by the following formula :
is heated with sulphur and sulphides of alkali metals there is obtained a valuable
brown dyestuff which is distinguished by its great tinctorial power and fastness.
The fact that the presence of a methyl group in the benzene-nucleus can to such a
degree influence the reaction that instead of a green dyestuff a brown colouring
matter is produced is very remarkable and unexpected.
The following example illustrates this invention.
"
25 kilos. of amidocresolsulphonic acid the constitution of which is given above are
introduced into the melted mixture of 75 kilos. of sodium sulphide and 30 kilos. of
sulphur at 115° to 120° C. The temperature is then raised to 140° to 150° C.
until the melted mass begins to thicken whereupon the temperature is carried by
degrees up to 180° to 200° C. and there maintained until the mass is dry. After
cooling, the product is pulverised and the brown-black powder obtained can be used
directly for dyeing. The new dyestuff dissolves in water with yellowish-brown
colour..
Mineral acids produce in this solution a brown precipitate. Concentrated sulphuric
acid dissolves the dyestuff with brown colour. The new colouring matter produces
on unmordanted cotton deep brown shades.
D
7th da Anni 1900
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Manufacture of a Brown Dyestuff directly dyeing Cotton.
-I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Buildings,
in the County of London, Consulting Engineer and Chartered Patent Agent, do hereby
declare the nature of this invention (as communicated to me from abroad by
Actien-Gesellschaft für Anilin Fabrikation, of Berlin, in the Empire of Germany,
Chemical Manufacturers,) and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement:-
It has been stated that by heating with sulphur and sulphides of alkali metals
certain derivatives of the benzene and naphthalene series, among others amidonaph-
tholsulphonic acids, black dyestuffs directly dyeing cotton are obtained.
It has also been stated that if amidooxysulphonic acids of the benzene series are 1
melted together with sulphur and sulphides of alkali metals colouring matters are
formed which likewise directly dye cotton. These dyestuffs however, do not yield
black, but green or olive green shades.
My foreign correspondents have now found that if, instead of the amidophenol-
sulphonic acids, amidocresolsulphonic acid, the constitution of which is represented 1
by the following formula:
is heated with sulphur and sulphides of alkali metals there is obtained a valuable
brown dyestuff which is distinguished by its great tinctorial power and fastness.
The fact that the presence of a methyl group in the benzene nucleus can to such a
degree influence the reaction that instead of a green dyestuff a brown colouring
natter is produced is very remarkable and unexpected.;
The following example illustrates this invention.
25 kilos. of amidoeresolsulphonic acid the constitution of which is given above are
introduced into the melted mixture of 75 kilos. of sodium sulphide and 30 kilos. of
sulphur at 115° to 120° C. The temperature is then raised to 140° to 150° C. until
the melted mass begins to thicken whereupon the temperature is carried by degrees
up to 180° to 200° C. and there maintained until the mass is dry. After cooling,
the product is pulverised and the brown-black powder obtained can be used directly
.for dyeing.
The new dyestuff dissolves in water with yellowish-brown colour.
Mineral acids produce in this solution a brown precipitate. Concentrated sulphuric
acid dissolves the dyestuff with brown colour. The new colouring matter produces on
unmordanted cotton deep 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:

page_text: 1. The herein described manufacture of a brown colouring matter directly dyeing
cotton by melting with sulphur and sulphides of alkali metals amido-cresol-sulphonic
acid, represented by the constitutional formula: