Improvements in the Manufacture of Colouring Matters, and in Dyeing or Printing Wool and other Fibres therewith.
Year: 1890

page_text: Date of Application, 3rd Feb., 1890
Complete Specification Left, 1st Nov., 1890-Accepted, 6th Dec., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Colouring Matters, and in
Dyeing or Printing Wool and other Fibres therewith.
I ROBERT HOLLIDAY of the firm of Read Holliday & Sons of Huddersfield in the
County of York, Manufacturing Chemist, do hereby declare the nature of this inven-
tion to be as follows:-
This invention relates to the manufacture of coloring matters, giving various colors
or shades or depths of color approaching to black from a suitable dinitroso or nitroso
compound of a dioxynapthaline, such as dioxynapthaline (A,-A3) known as
Armstrong's dioxynapthaline) by treatment thereof with a suitable reducing agent
such as hydrosulphite of sodium and the application or use of the coloring matter
developed in the dyeing or printing of wool or other fibres.
As an example of the method of manufacture and use in carrying the invention
into practical effect I take say 10 lbs. of the nitroso compound of dioxynaptha-
line (A-A) mixed in a sufficient quantity of water and to this I add a quantity of a
solution of hydrosulphite of soda until the bath becomes of a clear orange color, the
application of heat assisting the reaction. Into this bath the fibre to be dyed may be
dipped and the superfluous liquid having been removed or returned to the bath the
fibre is oxidized either by exposure to the air or otherwise the dyed fibre developes
shades of grey or black according to circumstances of the treatment.
The new coloring matter may be obtained in a state suitable for sale or otherwise
in a paste or dry state by oxidising the orange bath rendering the contained coloring
matter insoluble and then separating the insoluble matter by filtration or filtration and
washing in manner ordinarily employed in such treatments.
In order to render the coloring matter thus obtained in a pasty or dry state avail-
able for a bath it is remixed in water and treated with hydrosulphite of soda
until properly reduced when the fibre may be introduced and treated as before
mentioned.
Dated the 3rd day of February 1800
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Colouring Matters, and in
Dyeing or Printing Wool and other Fibres therewith.
I ROBERT HOLLIDAY of the firm of Read Holliday & Sons, of Huddersfield in the
County of York, Manufacturing Chemist do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
This invention relates to the manufacture of colouring matters, giving various
colours or shades or depths of colour approaching to black from a dinitroso or nitroso
compound of the following dioxynaphthalenes; naphthohydroquinone (A₁ A₂) Arm-
strong's dioxynaphthalene (A₁ A3) Armstrong's dioxynaphthalene (A, B) Ebert
& Merz's dioxynaphthalene (B₁ B₁) naphthohydroquinone (A, B₁); dioxynaphtha-
lene (B) and Erdman's dioxynaphthalene: by treatment thereof with a suitable
reducing agent such as hydrosulphite of sodium and the application or use of the
colouring matter developed in the dyeing or printing of wool or other fibres.
As an example of the method of manufacture and use in carrying the invention
PA

page_text: into practical effect, I take say 10 lbs. of the nitroso compound of dioxynaphtha-
lene (A, A,) mixed in a sufficient quantity of water and to this I add a quantity of a
solution of hydrosulphite of soda until the bath becomes of a clear orange colour, the
application of heat assisting the reaction. Into this bath the fibre to be dyed may be
dipped and the superfluous liquid having been removed or returned to the bath the
fibre is oxidized either by exposure to the air or otherwise; the dyed fibre developes
shades of grey or black according to circumstances of the treatment.
Other suitable reducing agents such as zinc in neutral, acid, or alkaline solutions,
may be employed.
The new colouring matter may be obtained in a state suitable for sale or otherwise
in a paste or dry state by oxidizing the orange bath rendering the contained colouring
matter insoluble and then separating the insoluble matter by filtration and washing
in the manner ordinarily employed in such treatments.
In order to render the colouring matter thus obtained in a pasty or dry state
available for a bath it is remixed in water and treated with hydrosulphite of soda
until properly reduced when the fibre may be introduced and treated as before
mentioned.
The reduced compound can be stiffened with gum or starch and applied to the fibre
by printing and then steamed to fix the colour.
The other dinitroso or nitroso compounds can be treated in a manner similar to
that which is given in the example.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The manufacture of colouring matters by the reduction of the dinitroso and nitroso
compounds of the dioxynaphthalenes defined herein, and the method of dyeing wool
and other fibres therewith substantially as described.
Dated the 31st day of October 1890.
WM. BROOKES & SON,
56 & 56, Chancery Lane, London, Agents for the Applicants.