Improvements relating to the Manufacture of Compounds designed for Dyeing and Printing.
Year: 1895

page_text: Date of Application, 19th Feb., 1895
Complete Specification Leit, 13th Oct., 1895-Accepted, 23rd Nov., 1895
PROVISIONAL SPECIFICATION.
Improvements relating to the Manufacture of Compounds
designed for Dyeing and Printing.
We, LA SOCIÉTÉ ANONYME DES MATIÈRES. COLORANTES & PRODuits
CHIMIQUES DE SAINT DENIS, of Saint Denis, near.Paris, and RAYMOND VIDAL,
Chemist of 95 Boulevard Beaumarchais, Paris, both in the Republic of France,
do hereby declare the nature of this invention to be as follows:-
Our invention relates to the manufacture of compounds designed for dyeing and
-printing.
By the action of sulphur and alkalies upon a great number of substances brown
colouring matters called "Laval. Catechu" are obtained which have an indefinite
constitution and to which Witt has given the name of "mercaptoic acid
(Bericht VII, page 1530).
:
Recently the same reaction applied to bisubstituted bodies of the aromatic series
(Letters Patent No. 19880 dated 21st October 1893) has given rise to colouring
matters of great industrial value by reason of the variety of the shades obtained.
Whatever may be their origin, all these colouring matters possess similar properties,
that is to say they are insoluble in the usual solvents (alcohol, ether, benzene) and in
dilute acids; on the other hand they dissolve easily in alkalies and alkaline sulphides
with a characteristic bottle-green coloration; lastly they all possess the valuable
property. of dyeing unmordanted vegetable fibres in shades of extraordinary
fastness.
Great interest attached to the utilization of these colouring matters in dyeing
and printing without the employment of alkaline solutions and especially alkaline
solutions of sulphides.
We have succeeded in obtaining soluble compounds by treating these colouring
matters, precipitated from their solution, by -au acid, with alkaline sulphites or
bisulphites; the compounds obtained are employed directly with addition of an
inspissation either in dyeing or in printing.

page_text: heating paraamidophenol with sulphur and caustic soda to 180° is, brought as in
Example I to the form of paste containing 12 to 15 per cent of the dry product.
We treat 100 kilogrammes of this paste by 45 to 60 kilogrammes of crystallized
sulphite of soda and at the end of three days the solubilisation will be complete.
The product may be supplied to the consumers in this state or dried to form a
powder.
11:
Dated this 12th day of February 1895.
”ን
HASELTINE, LAKE. & Co.,
45 Southampton Buildings, London, WC, Agents for the Applicants.
COMPLETE SPECIFICATION.
4
"
Improvements relating to the Manufacture of Compounds
designed for Dyeing and Printing.
*
We, LA SOCIÉTÉ ANONYME DES MATIÈRES COLORANTES & PRODUITS
CHIMIQUES DE SAINT DENIS, of Saint Denis, near Paris, and RAYMOND
VIDAL, of 95 Boulevard Beaumarchais, Paris,: Chemist, both in the, Republic of
France, do hereby declare the nature of this invention, and in what manner
the same is to be performed, to be particularly described and. ascertained in
and by the following statement :-
‚i.
1.:!
Our invention relates to the manufacture of compounds designed for dyeing
and printing.
1.
I
By the action of sulphur and alkalies upon a great number of substances brown
colouring matters called" Laval Catechu "are obtained which have an undetermined
composition and to which Witt has given the name of "mercaptoic acid "
(Bericht VII, page-1530).
·
.:
Recently the same reaction applied to bisubstituted bodies of the aromatic series
(Letters Patent No. 19880, dated 21st October 1893) has given rise to colouring
matters of great industrial value by reason of the variety of the shades obtained.
Whatever may be their origin, all these colouring matters possess similar properties,
that is to say, they are insoluble in the usual solvents (alcohol, ether, benzene) and
in dilute acids; on the other hand they dissolve easily in alkalies and alkaline
sulphides with characteristic bottle-green coloration lastly they all possess the
valuable property of dyeing unmordanted vegetable fibres in shades of extraordinary
fastness:
a
.: 1
Great interest attached to the utilization of thèse colouring matters in dyeing
and printing without the employment of alkaline solutions and especially alkaline
solutions of sulphides.
We have succeeded in obtaining soluble compounds by treating these colouring
matters, precipitated from their solution by an acid, with alkaline sulphites or
bisulphites; the compounds obtained are employed directly with addition of, an
inspissation either in dyeing or in printing.

page_text: supply the product directly to the consumer. The product may also be dried and
supplied in the form of a powder. We may replace the sulphite of soda by a
corresponding quantity of bisulphite.
EXAMPLE II.
One of the colouring matters obtained by the action of sulphur and alkalies
upon the bisubstituted bodies of the aromatic series, for example that obtained by
heating paraamidophenol with sulphur and caustic soda to 180° is brought as in
Example I to the form of a paste containing 12 to 15 per cent. of the dry product.
We treat 100 kilogrammes of this paste by 45 to 60 kilogrammes of crystallized
sulphite of soda and at the end of three days the solubilisation will be complete.
The product may be supplied to the consumers in this state or dried to form a
powder.
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 :-
:
་
1. An improved process of obtaining soluble combinations, applicable for dyeing
or printing, consisting in treating by alkaline sulphites or bisulphites those
colouring matters of indefinite constitution which are obtained by the action of
sulphur upon bodies of the fatty or aromatic series and characterized by the fact
that they are totally insoluble in acids but are soluble in alkalies and in the alkaline
sulphides with a bottle-green coloration.
2. The application of the process described in Claim 1 consisting in treating, by
alkuline sulphites or bisulphites, the colouring matters known by the name of
"Laval Catechu."
3. The application of the process described in Claim 1 consisting in treating, by
alkaline sulphites or bisulphites, the colouring matters obtained by the action of
sulphur upon the substituted amines of benzene.
Dated this 17th day of October 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.