Improvements in the Manufacture of Colouring Matters.
Year: 1897

page_text: Improvements in the Manufacture of Colouring Matters.
I, HENRI RAYMOND VIDAL, of 95. Boulevard Beaumarchais, Paris, in the
Republic of France, Chemical Engineer, do hereby declare the nature of this
invention to he as follows:-
This invention relates to the production of fast colours for dyeing cotton.
The action of sulphur on a mixture of two paradisubstitutes of the henzine series
such as hydroquinone and paramidophenol, or paramidophenol and paraphenylene
diamine, results in thiazines, such as thionol and thionoline. These thiazines
are fugitive colouring matters, and do not directly dye the cotton.
On the other hand, sulphur re-acting on the metadisubstitutes (amines or
phenols) of benzine produce colours which directly dye the cotton, but in brown
and yellowish tints, generally of no great intensity.
I have discovered that if the sulphur be applied as a re-agent to a mixture com-
posed of a molecule of a para-derivative of the benzine series and a molecule of
a meta-derivative of the same series, black colouring matters of great intensity
are produced, which are not affected by light and, can be applied directly to the
dyeing of vegetable fibres.
Some of these products possess the property of solubility in acids and of being
in this condition capable of application to fibres such as wool and silk.
Example I. In an oil bath at a temperature of about 200 degrees, placed in
an iron vessel furnished with an agitator, I heat:
11 kilograms of hydroquinone.
11 kilograms of metamidophenol.
3 kilograms of sulphur.
I arrest the operation when the evolution of sulphuretted hydrogen slackene
and the mixture has thickened. The colouring body appears in the form of a
black substance with copper-coloured reflections. It is soluble in alkalies and
alkaline sulphides and in this condition, will directly dye cotton.
Example II. In an oil-bath at a temperature of about 200°, placed in an iron
vessel furnished with an agitator, I heat:.
11 kilograms of hydroquinone.
11 kilograms of metaphenylene diamine.
3 kilograms of sulphur.

page_text: Similarly, in Example 11, I can replace the hydroquinone by resorein and the
metaphenelyne diamine by paraphenylene diamine.
Example III. On the other hand, if I heat, at a temperature of about 200
degrees, in a heating pan, and agitate at the same time a mixture composed of:
11 kilograms of meiamidonhenol.
ILASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
Improvements in the Manufacture of Colouring Matters.
1, HENRI RAYMOND VIDAL, of 95, Boulevard Beaumarchais, Paris, in the
Republic of France, Chemical Engineer, 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 production of fast colours for dyeing cotton.
The action of sulphur on a mixture of two paradisubstitutes of the houzine series
such as hydroquinone and paramidophenol, or paramidophenol and paraphenylene
diamine, results in thiazines, such as thionol and thionoline. These thinzines
are fugitive colouring matters, and do not directly dye the cotton.
On the other hand, sulphur re-acting on the metadisubstitutes (amines or
phenols) of benzine produce colours which directly dye the cotton, but in brown
and yellowish tints, generally of no great intensity.

page_text: The resulting deep black substance is hard and less soluble in alkalies and sulphide
of sodium than the colouring bodies above described; in this condition (that is in
solution) it dyes cotton grey.
In the various reactions in which metaphenylene diamine is employed, I can
replace it by metacresylene diamine.
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:
1. The process of manufacturing colouring matters consisting in causing sulphur
to act, under heat, upon a mixture formed by a paraderivative of the series of
benzine and a metaderivative of the same series, in equal proportions, substan-
tially as above described.
2. In the process above referred to, the action of sulphur, heated to about 200
degrees centigrade, upon a mixture of metamidophenol and hydroquinone in equal
proportions.
3. In the process referred to in the first claim, the action of sulphur, heated to
about 200 degrees centigrade, upon a mixture, formed by equal proportions of
metaphenylene diamine and hydroquinone.
4. In the process referred to in the first claim, the action of sulphur, heated to
aliout 200 degrees centigrade, upon a mixture formed by equal proportions of
resorein and paramidophenol.
5. In the process referred to in the first claim, the action of sulphur, heated to
about 200 degrees centigrade, upon a mixture, formed by equal proportions of
resorciu and paraphenylenediamine.
6. In the process referred to in the first claim, the action of sulphur, heated to
about 200 degrees centigrade, upon a mixture formed by equal proportions of
metamidophenol and paramidophenol,
7. In the process referred to in the first claim, the action of sulphur, heated to
about 200 degrees centigrade, upon a mixture, formed by equal proportions of
metamidophenol and paraphenylene diamine.
S. In the process referred to in the first claim, the action of sulphur, heated to
about 200 degrees centigrade, upon a mixture, formed by equal proportions of
paramidophenol and metaphenylene diamine.
9. In the process referred to in the first claim, the action of sulphur, heated to
about 200 degrees centigrade, upon a mixture, formed by equal proportional
quantities of paraphenylenediamine and metaphenylene diamine.
10. The substitution of metacresylenediamine for the metaphenylenediamine in
those reactions, where it is employed.
11. The colouring matters obtained in the preceding reactions, soluble in
alkalies and in sulphides of sodium and dyeing cotton, directly, in black or grey
tints.
D
1011
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.