Year: 1888

page_text: 1, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman, (a communication
to me from abroad by Messrs. Leopold Cassella & Co. of Frankfort on Main) do hereby
declare the nature of this invention to be as follows:-
This invention relates to the manufacture of new blue coloring matters which are
formed by the action of the paranitrosoderivates of secondary and tertiary amines (such
as dimethylaniline, diethylaniline, monomethylaniline, monoethylaniline, dimethyl-
orthotoluidinė etc.) on the diphenylmetaphenylendiamine C, H, (N H C, H,), and its
homologues.
Example: In order to carry out the invention I may proceed as follows:
25 Kg. of diphenylmetaphenylendiamine (or the corresponding quantity of ditolyl-
metaphenylendiamine, or dixylylmetaphenylendiamine) 1 heat in alcoholic solution
with 50 Kg. of hydrochlorate of nitrosodimethylaniline. As soon as the reaction is
finished the smelt is diluted with water, filtered and the coloring matter is precipitated
by means of common salt. If less of the nitroso compound for instance only 25 Kg.
are used, the shade of the coloring matter becomes somewhat more violet. Instead
of alcohol other dissolvants may be used.
The coloring matter represents a powder of bronze like appearance. It dissolves
in strong sulphuric acid with a black shade. It dyes wool, silk and mordanted cotton
in dark blue shades which resist wasbing.
Dated this 19th day of April 1888.

page_text: COMPLETE SPECIFICATION.
New Blue Coloring Matters and in the Manufacture of the same.
I, SYDNEY PITT of Sutton in the County of Surrey, Gentleman, (a communication
to me from abroad by Messrs. Leopold Cassella & Co. of Frankfort on Main) 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 manufacture of new blue coloring matters which are
formed by the action of the paranitrosoderivatives of secondary and tertiary amines
(such as dimethylaniline, diethylaniline, monomethylaniline, monoethylaniline, dime-
thylorthotoluidine, etc.) on the diphenylmetaphenylendiamine C, H, (N H Ú₁ H₂),
and its homologues.
Example: In order to carry out the invention I may proceed as follows:-
25 Kg. of diphenylmetaphenylendiamine (or the corresponding quantity of ditolyl-
metaphenylendiamine, or dixylylmetaphenylendiamine) I heat in alcoholic solution
with 50 Kg. of hydrochlorate of nitrosodimethylaniline. As soon as the reaction is
finished the smelt is diluted with water, filtered and the coloring matter is precipitated
by means of common salt. If less of the nitroso compound for instance only 25 Kg.
are used, the shade of the coloring matter becomes somewhat more violet. Instead
of alcohol other dissolvants may be used.
The coloring matter represents a powder of bronze like appearance. It dissolves in
strong sulphuric acid with a black shade. It dyes wool, silk and mordanted cotton in.
dark blue shades which resist washing.
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 :-
1. The process or processes herein described of manufacturing blue coloring matters
by causing the paranitrosoderivatives of secondary and tertiary amines to react upon
diphenylmetaphenylendiamine, ditolylmetaphenylendiamine or dixyly Imetaphenylen-
diamine.
2. As new articles of manufacture the blue coloring matters formed by the process
or processes of 1st claim.
1