Manufacture of a Blue to Black Cotton Dyestuff.
Year: 1899

page_text: Date of Application, 21st Apr., 1899
Complete Specification Left, 12th Jan. 1900-Accented 17th Feb
1000
PROVISIONAL SPECIFICATION.
Manufacture of a Blue to Black Cotton Dyestuff.
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:-
New cotton dyestuffs, characterised by their beautiful tints, may be obtained
if dinitro-para-amidodiphenylaminesulphonic acid or its salts be melted with
sulphur and sulphides of alkali metals.
A good yield of the said sulphonic acid is obtained if para-phenylenediamine-
sulphonic acid be combined with dinitrochlorobenzene and best in the presence
of agents capable of combining with hydrochloric acid, such as, acetates. It is
preferable to operate in an aqueous alcoholic solution at the temperature of the
water bath.
The sodium salt forms crimson-red laminæ, easily soluble in hot water, less
easily in cold water; hydrochloric acid separates the free sulphonic acid from this
salt in form of a lemon-yellow powder.
The following example illustrates the process.
10 parts by weight of dinitro-para-amido-diphenylaminesulphonate of sodium
are gradually heated on the oil-bath with 20 parts by weight of sulphur and 50 parts
by weight of sodium sulphide while water is added to keep the mass liquid at a
temperature of 150° to 190° C. (as indicated by the thermometer in the oil bath)
and the whole is kept at this temperature for several hours. It is then further
heated till the produce has become dry, the dyestuff being thus obtained in a
condition fit for use in dyeing. It is in the form of a black powder easily
soluble in water directly dyeing cotton blue to black shades.
Dated this 21st day of April 1899.
ABEL & IMRAY,
Agents for the Applicant.
Manufacture of a Blue to Black Cotton Dyestuff.
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 per-
[Price 8d.]

page_text: formed, to be particularly described and ascertained in and by the following
statement:-
New cotton dyestuffs, characterised by their beautiful tints, may be obtained
if dinitro-para-amidodiphenylaminesulphonic acid or its salts be melted with
sulphur and sulphides of alkali metals.
A good yield of the said sulphonic acid is obtained if para-phenylenediamine-
sulphonic acid be combined with dinitrochlorobenzene and best in the presence
of agents capable of combining with hydrochloric acid, such as, acetates. It is
preferable to operate in an aqueous alcoholic solution at the temperature of the
water bath.
The sodium salt forms crimson-red laminæ, easily soluble in hot water, less
easily in cold water; hydrochloric acid separates the free sulphonic acid from this
salt in form of a lemon-yellow powder.
The manufacture of the dyestuff from the acid above described is illustrated by
the following example.
10 parts by weight of sodium dinitro-para-amidodiphenylaminesulphonate are
gradually heated on the oil-bath with 20 parts by weight of sulphur and 50 parts
by weight of sodium sulphide, while water is added to keep the mass liquid at a
temperature of 150° to 190° C. (as indicated by the thermometer in the oil bath)
and the whole is kept at this temperature for several hours. It is then further
heated till the product has become dry, the dyestuff being thus obtained in a
condition fit for use in dyeing. It is in the form of a black powder easily
soluble in water directly dyeing cotton blue to black shades.
Having thus particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what
I claim is:-
1. The herein described manufacture of a blue-black cotton dyestuff by heating
with sulphur and alkali sulphide the dinitro-amidodiphenylaminesulphonic acid
obtained by combining para-phenylenediaminesulphonic acid with dinitrochloro-
benzene.
2. The blue-black cotton dyestuff manufactured as above set forth.
1000