Improvements in Treating Nitroso Compounds for use in Dyeing Animal Fibres.
Year: 1892

page_text: Date of Application, 31st Mar., 1892
Complete Specification Left, 22nd Dec., 1892-Accepted, 11th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Treating Nitroso Compounds for use in Dyeing
Animal Fibres.
We READ HOLLIDAY & SONS LIMITED of Upperhead Row, Huddersfield, in
the County of York, Manufacturing Chemists, and LEWIS GORDON PAUL Ph.D.
of Turnbridge Chemical Works, Huddersfield aforesaid, Chemist in the employ-
ment of the said Read Holliday & Sons Limited do hereby declare the nature of
this invention to be as follows
--
It is well known that lakes insoluble in water are formed by the combination of
various nitroso compounds of the dioxynaphthalenes, the naphthols and resorcine
with ferrous salts, and that this reaction has been utilised in dyeing by first
mordanting wool with a ferrous salt, and then dyeing a green colour by treating
the wool so prepared with a solution of one or other of these nitroso bodies.
Now this improvement consists in making the combination in presence of oxalic
acid, and thereby enabling us to dye the colour in one bath alone. or in combination
with logwood or other dye stuffs that are at present dyed with ferrous salts as
mordant.
Example I. As an example of our method of preparation, we take say 50 parts of
dinitroso-dioxynaphthalene paste (Ebert & Merz) containing say 30 per cent. dry
dinitroso-dioxynaphthalene and mix it with say 23 parts crystallized ferrous
sulphate (copperas) in a fine state of division and a small quantity of water.
It is not necessary that the ferrous sulphate should dissolve, or that the combi-
nation should take place at this stage, as the formation of the soluble colour takes
place later in the dye bath, when the two constituents are heated in the presence
of oxalic acid.
The paste thus formed is added to the dye bath in quantities varying according
to the intensity of the shade required and say about 12 of the weight of the paste
of oxalic acid is added thereto.
Animal fibres can then be dyed by heating the bath and dyeing in the ordinary
way.
These colouring matters prepared in this way have the advantage of dyeing in
the same bath with logwood or fustic or their extracts.
Example II. For example, the shade of green obtained by the above process
can be rendered very much darker by adding to the dye bath, prepared as in
Example I, an amount of logwood proportional to the depth of shade required,
and then dyeing in the ordinary way.
By this means very deep shades of green black can be produced.
Dated the 31st der of March 1892.
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Treating Nitroso Compounds for use in Dyeing
Animal Fibres.
We READ HOLLIDAY & Sons LIMITED of Upperhead Row, Huddersfield, in
the County of York, Manufacturing Chemists, and LEWIS GORDON PAUL Ph.D.
of Turnbridge Chemical Works, Huddersfield aforesaid, Chemist, in the employ-
ment of the said Read Holliday & Sons Limited do hereby declare the nature of

page_text: this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
It is well known that lakes insoluble in water are formed by the combination of
various nitroso compounds of the dioxynaphthalenes, the naphthols and resorcine
with ferrous salts, and that this reaction has been utilised in dyeing by first
mordanting wool with a ferrous salt, and then dyeing a green colour by treating
the wool so prepared with a solution of one or other of these nitroso bodies.
Now this improvement consists in making the combination in presence of oxalic
acid, and thereby enabling us to dye the colour in one bath alone, or in combination
with logwood or other dye stuffs that are at present dyed with ferrous salts as
mordant.
Example I. As an example of our method of preparation, we take say 50 parts
of dinitroso-dioxynaphthalene paste (Ebert & Merz) containing say 30 per cent.
dry dinitroso-dioxynaphthalene and mix it with say 23 parts crystallized ferrous
sulphate (copperas) in a fine state of division and a small quantity of water.
It is not necessary that the ferrous sulphate should dissolve, or that the combi-
nation should take place at this stage, as the formation of the soluble colour takes
place later in the dye bath, when the two constituents are heated in the presence
of oxalic acid.
The paste thus formed is added to the dye bath in quantities varying according
to the intensity of the shade required, and say about of the weight of the paste
of oxalic acid is added thereto.
Animal fibres can then be dyed by heating the bath and dyeing in the ordinary
way.
These colouring matters prepared in this way have the advantage of dyeing in
the same bath with logwood or fustic or their extracts;
Example II. For example, the shade of green obtained by the above process
can be rendered very much darker by adding to the dye bath, prepared as in
Example I, an amount of logwood proportional to the depth of shade required,
and then dyeing in the ordinary way. By this means very deep shades of green
black can be produced.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
In treating nitroso compounds for use in dyeing animal fibres, the combination
of the above mentioned nitroso compounds of dioxynaphthalenes, or naphthols or
resorcine with a ferrous salt, in one bath, by means of oxalic acid.
Dated the 2nd day of December 1809
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicants.