Manufacture of Coloring Matters giving Grey, Brown, and Analogous Tints.
Year: 1889

page_text: Date of Application, 22nd Mar., 1889
Complete Specification Left, 21st Nov., 1889-Accepted, 21st Dec., 1889
PROVISIONAL SPECIFICATION.
[Communicated from abroad by LA SOCIÉTÉ ANONYME DES MARTIÈRES COLORANTES
ET PRODUITS CHIMIQUES DE ST. DENIS, of 105, Rue Lafayette, Paris, France.]
Manufacture of Coloring Matters giving Grey, Brown, and
Analogous Tints.
I, JOHN IMRAY of No. 28 Southampton Buildings, Chancery Lane in the
County of Middlesex, Consulting Engineer and Patent Agent do hereby declare
the nature of this invention to be as follows :-
This invention relates to the preparation of coloring matters from the nitrosos of
aromatic amines.
It has been observed by my correspondents that, under the influence of heat, the
salts of the paranitroso derivatives are transforined into coloring matters of variable
tints passing from brown to grey.
"
Among the paranitroso derivatives employed for this purpose may be mentioned,
firstly, the nitrosos of tertiary amines such as dimethylaniline, ethylaniline, methyl-
ethylaniline dimethyltoluidine, dimethyltoluidine, dimethylnaphthylamine &c. secondly,
the nitrosos of secondary amines such as monoethylaniline, diphenylamine, monome-
thyltoluidine &c.
EXAMPLE OF THE PREPARATION OF THE COLORING MATTER.
10 kilos of hydrochlorate of nitroso dimethylaniline are dissolved in 50 litres of
water, and the solution is heated to boiling point for three hours.
After cooling, the product is run into 100 litres of water and the coloring matter
is precipitated from the solution by means of a mineral salt such for example as
chloride of zinc.
The precipitated coloring matter is collected on the filter and is dried at 80° Cent.
The reaction may be effected as well in an alcoholic medium as in water, and the
alcohol or water may even be replaced by benzine, toluine or other hydrocarbons.
The above example applies equally if, in place of nitroso dimethylaniline other
nitrosos of tertiary and secondary nitrosos of amines are employed.
The tints of the coloring matters obtained vary from brown to grey. They are all
obtained in the form of a brown powder soluble in water, alcohol, and acids.
The solutions are precipitated by alkalis and alkaline carbonates, giving brown
flakes which are sufficiently soluble in hot water and insoluble in cold water.
The new coloring matters are basic and dye cotton mordanted with tannin, giving
grey tints very resisting to soap, the atmosphere and light. They can be printed on
cotton mordanted with tannin.
Dated this 22nd day of March 1889
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Manufacture of Coloring Matters giving Grey, Brown, and
Analogous Tints.
I, JOHN IMRAY of No. 28 Southampton Buildings, Chancery Lane in the County of
Middlesex Consulting Engineer and Patent Agent 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 :-
This Invention relates to the preparation of coloring matters from the nitrosos of
aromatic amines.

page_text: It has been observed by my correspondents that under the influence of heat the
salts of the paranitroso derivatives are transformed into colouring matters of variable
tints passing from brown to grey. Among the paranitroso derivatives employed for
this purpose may be mentioned firstly, the nitrosos of tertiary amines such as dimethyl-
aniline, ethylaniline, methylethylaniline dimethyltoluidine, dimethylnaphthylamine &c.;
secondly, the nitrosos of secondary amines such as monoethylaniline, diphenylamine,
monomethyltoluidine, &c.
EXAMPLE OF THE PREPARATION OF THE COLORING MATTER.
10 kilos of hydrochlorate of nitroso dimethylaniline are dissolved in 50 litres of
water and the solution is heated to boiling point for three hours. After cooling the
product is run into 100 litres of water and the coloring matter is precipitated from
the solution by means of a mineral salt, such for example as zinc chloride.
The precipitated coloring matter is collected on the filter and is dried at 80° Cen-
tigrade.
The reaction may be effected as well in an alcoholic medium as in water, and for
the alcohol or water may even be substituted benzine, toluine or other hydrocarbons.
The above example applies equally if in place of nitroso dimethylaniline, other
nitrosos of tertiary and secondary amines are employed.
The tints of the coloring matters obtained vary from brown to grey. They are all
obtained in the form of a brown powder, soluble in water, alcohol and acids.
The solutions are precipitated by alkalies and alkaline carbonates, giving brown
flakes which are very soluble in hot water and are insoluble in cold water.
The new coloring matters are basic, and dye cotton mordanted with tannin, giving
grey tints very resisting to soap, to the atmosphere and to light. They can be used
for printing on cotton mordanted with tannin.
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 grey or brown colouring matters by treatment of nitroso
derivatives of secondary and tertiary aromatic amines, substantially as described.
Dated this 21st day of November 1889.
ADEL & IMKAY,
Agents for the Applicant.