Improvements relating to the Manufacture of Colouring Matters.
Year: 1893

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 18 of the Patents, &c. Act, 1883), as allowed
by the decision of the Law Officer of the 29th day of July 1898.
Date of Application (in United Kingdom), 21st Oct., 1893
Complete Specification Left, 12th July, 1894-Accepted, 18th Aug., 1894
Improvements relating to the Manufacture of Colouring Matters.
I, RAYMOND VIDAL, of 95, Boulevard Beaumarchais, Paris, in the Republic of
France, Chemist, do hereby declare the nature of this invention to be as
follows:-
-
My invention relates to the manufacture of colouring matters for dyeing
without mordants.
According to my said invention I obtain such dyes by heating progressively
in a closed vessel a certain quantity of pyrocatechine, hydroquinone or toluquí-
none with sulphur and ammonia or a fatty or aromatic amine.
I may heat each of the above-mentioned diphenols either. with sulphides of
ammonium or amines or in the presence of sulphur with a mixture of ammo-
nium or amine salt and caustic alkali or an alkaline earthy base, or lastly with
any mixture capable of disengaging ammonia or a free amine, always in the
presence of sulphur.
By this process I obtain a series of colouring matters the tints of which vary
according to the temperature and according to the proportions of the mixture
employed.
Dated this 21st day of October 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements relating to the Manufacture of Colouring Matters.
I, RAYMOND VIDAL, of 95, Boulevard Beaumarchais, Paris, in the Republic of
France, Chemist, do hereby declare the nature of this invention, and in what
[Price Su]

page_text: manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement;-
-
I have found that I can obtain a whole series of very interesting colouring
matters for dyeing unmordanted fibres, by causing sulphur in the presence of
ammonia or fatty amines to react upon ortho or para dioxybenzols.
I employ either ammonia or fatty amines in the free state, or any mixture
susceptible of giving rise to them during the course of the reaction.
I may operate in an open vessel or in a closed vessel at a temperature varying
between 130 degrees and 200 degrees. The nature of the colouring matters
obtained varies according as the temperature has been more or less high.
+Kilogrammes of ammonium nyaroen rate
6 kilogrammes of caustic soda for five hours from 160 degrees to 210 degrees.
At the end of this time I cool, pulverize the mass, and use the colouring
matter for dyeing purposes without any other purification.
If I treat the aqueous solution of these crude colouring matters by dilute
sulphuric acid I may obtain a division of these various colouring matters. The
addition of sulphuric acid causes a disengagement of sulphurated hydrogen at
the same time as the precipitation of the greatest part of the colouring matters
in solution. The colouring matters precipitated by the acid are rather soluble
in caustic soda, very soluble in alkaline sulphides with a bottle-green coloration;
in this form they dye vegetable fibres blue grey, dark blue and black.
On the other hand the colourless acid liquor, filtered from the precipitate, is
coloured after neutralization with caustic soda either in the presence of air or in
the presence of oxidizing agents and assumes an intense blue violet tint. This
colouring matter, which is produced only in very slight proportion, dyes wool in
a neutral bath blue violet, in an acid bath orchal red.
The reaction takes place in a similar manner if the quinone is replaced by
hydroquinone.
The other colouring matters are obtained by replacing in the Example I the
quinone by toluquinone and pyrocatechine, and ammonia by a fatty amine such
as mono or dimethylamine.
The various colouring matters thus obtained are used for dyeing in the crude
form, they may also be purified by subjecting them to the sulphuric treatment
before set forth, but in this state they must, in order to be employed for dyeing
have an appropriate quantity of sodium sulphide added, which must reach in
practice 2 to 3 times the weight of the colouring matter, as a starting point.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is..
A process of preparing greenish black, bluish black and black colouring
matters for dyeing without mordants by causing sulphur and alkaline sulphides
to react upon ortho and para dioxy-benzols such as hydroquinone (quinone)
hydrotoluquinone (toluquinone) and pyrocatechine in the presence of ammonia
or fatty amines, or substances capable of giving rise to these bodies during the
course of these reactions
Dated this 12th day of July 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.