Manufacture of a Black Colouring Matter Directly Dyeing Cotton.
Year: 1899

page_text: + NO VIDIONAL SPECIFICATION.
Manufacture of a Black Colouring Matter Directly Dyeing Cotton.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, 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:-
This invention relates to the manufacture of a black colouring matter directly
dyeing cotton.
It is based on the following observation.
If quinonechlorimide is treated with a solution of hyposulphites in the pre-
sence of mineral acids the mixture gradually assumes a dark colour and finally
a black precipitate separates which dissolves in solutions of alkalies or alkali car-
bonates. The solution's thus obtained dye cotton directly black shades.
The following example further illustrates the invention:-
10 parts of quinonechlorimide are suspended in a solution of 15.5 parts of
sodium hyposulphite in the least possible quantity of water; 200 parts of diluted
sulphuric acid containing 33 per cent. SO, are added in the cold to the mixture
which is thereupon slowly heated. The colour of the solution at first turns red-
brown and afterwards black-brown.
Finally the mixture is boiled for 1 to 2 hours. A black precipitate separates
which, after refrigeration, is filtered off and washed with some water; it is then
lissolved by treatment with a solution of sodium carbonate or diluted soda lye and
he colouring matter is precipitated from the liquor obtained by addition of
ommon salt. The product thus obtained dyes unmordanted cotton dark black
hades.
Dated this 23rd day of May 1899
ABEL & IMRAY,
Agents for the Applicant.
Tack
ring Matter Directly Dyeing Cotton.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, 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
[Price 8d.]

page_text: 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 fol-
lowing statement:
This invention relates to the manufacture of a black colouring -matter directly
dyeing cotton.
It is based on the following observation.
If quinone-chlorimide is treated with a solution of a hyposulphite in the pre-
sence of mineral acids the mixture gradually assumes a dark colour and finally
a black precipitate separates which dissolves in solutions of alkalies or alkali car-
bonates. The solutions thus obtained dye cotton directly black shades.
The following example further illustrates the invention:
10 parts of quinone-chlorimide are suspended in a solution of 15.5 parts of
sodium hyposulphite in the least possible quantity of water: 200 parts of diluted
sulphuric acid containing 33 per cent. H₂SO, are added in the cold to the mixture
which is thereupon slowly heated. The colour of the solution at first turns red-
brown and afterwards black-brown.
Finally the mixture is boiled for 1 to 2 hours. A black precipitate separates,
which, after refrigeration. is filtered off and washed with some water; it is then
dissolved by treatment with a solution of sodium carbonate or diluted soda lye and
the colouring matter is precipitated from the liquor obtained by addition of
common salt. The product thus obtained dyes unmordanted cotton dark black
shades.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I wish it to be
understood that it has been proposed to produce black colouring matters which
dye cotton directly from a sodium sulphide bath by acting upon paranitro-
sophenol, paranitrosoaniline, or similar quinonoid compounds, with two mole-
cular proportions of a thiosulphate in weak acid solution, licating the dithio-
sulphonic acid thus produced with quinone-chlorimide and ultimately boiling
the intermediate product so formed in acid solution, such processes being carried
out successively or simultaneously in the same solution, and I make no claim
to such invention, but I declare that what I claim is:-
1. The hereindescribed manufacture of a black colouring matter directly dyeing
cotton by treating quinone-chlorimide with solutions of hyposulphites in the
presence of mineral acids.
2. The colouring matter manufactured as above set forth.