Process for the Manufacture of Brown to Black Dyestuffs.
Year: 1897

page_text: Date of Application, 27th May, 1897
Complete Specification Left, 26th Feb., 1898-Accepted, 16th Apr.,
1898
PROVISIONAL SPECIFICATION.
Process for the Manufacture of Brown to Black Dyestuffs.
I, OLIVER IMRAY, of No. 28, Southampton Buildings, Chancery Lane, 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 and Bruning, of Hoechst a/Main, in the Empire of Germany, Chemical
Manufacturers), to be as follows:-
My foreign correspondents have found that sulphonic acids of amido naphthols,
dioxynaphthalenes, their nitroso derivatives and azodyestuffs derived from them
may be transformed into brown to black dyestuffs by being heated for a consider-
able time with sodium sulphide and sulphur; in employing the dioxysulphonic
acids it is best to add ammonia salts.
The products obtained are easily soluble in water and dye cotton direct without
mordant.
The process for instance is as follows:-
1 part by weight of 2.8.6 amidonaphtholsulphonate of sodium is heated with
stirring for one hour to 100°-120° C with several times the quantity of sodium
sulphide and double the quantity of sulphur; the temperature is gradually raised
and finally kept at 2000-250° C. for several hours. The pulverised product of
the reaction is black, easily soluble in water with a brownish green colour.
The solution dyes cotton direct greenish-black.
Acids precipitate from the solution the dyestuff soluble in alkalies.
Process for the Manufacture of Brown to Black Dyestuffs.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings,
Chancery Lane, in the County of London, Chartered Patent Agent, (but formerly
of No. 28, Southampton Buildings, Chancery Lane, in the County of London,)
do hereby declare the nature of this invention (as communicated to me from abroad
by the Farbwerke vormals: Meister Lucius and Bruning, of Hoechst a/Main, 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:.
My foreign correspondents have found that sulphonic acids of amido naphthols,
dioxynaphthalenes, their nitroso derivatives and azodyestuffs derived from them

page_text: may be transformed into brown to black dyestuffs by being heated for a considerable
time with sodium sulphide and sulphur; in employing the dioxysulphonic acids
it is best to add ammonia salts.
The products obtained are easily soluble in water and. dye.cotton direct without
mordant.
The process for instance is as follows:-
1 part by weight of 2.8.6 amidonaphthol sulphonate of sodium is heated with
stirring for one hour to 1000-1200° C with several times the quantity of sodium
sulphide and double the quantity of sulphur; the temperature is gradually raised
and finally kept at 2000-250° C for several hours. The pulverised product of
the reaction is black, easily soluble in water with a brownish green colour.
The solution dyes cotton direct greenish-black..
Acids precipitate from the solution the dyestuff soluble in alkalies.
In a similar manner brown to black dyestuffs may be obtained by heating other
amido-oxy-and dioxysulphonic acids, such, for instance, as 1. 8. 3. 6 and 1. 8. 3. 5
amidonaphthol disulphonic acids 1. 8. 3. 6, 1. 8. 2. 4 dioxynaphthaline disulphonic
acids.
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 brown to black dyestuffs by heating
amidonaphtholsulphonic acids and dioxynaphthalinesulphonic acid with sodium
sulphide and sulphur.
2. The dyestuffs manufactured as above set forth
(
Dated this 26th day of February 1898.
ABEL & IMRAY,
Agents for the Applicant.