Improvements in the Manufacture of a Diamido Base, and of Tetrazo Colouring Matters derived therefrom.
Year: 1894

page_text: Date of Application, 1st Feb., 1894-Accepted, 3rd Mar., 1894
COMPLETE SPECIFICATION.
Improvements in the Manufacture of a Diamido Base, and of Tetrazo
Colouring Matters derived therefrom.
We, WILLIAM GOULDEN THOMPSON, of Tonge Spring Works, Middleton, in
the County of Lancaster, Aniline Dye Manufacturer, and IRA MOORE, of the same
place, Chemist, 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 a new unsymmetric diamido base by
condensation of one molecule tolidine with one molecule formaldehyde and one
molecule basic meta-toluylenediamine hydrochloride, and to the manufacture of new
direct cotton dyes therefrom.
This new condensation product can be prepared according to the following
method:-
:-
21.2 lbs. tolidine and 15.9 lbs. basic hydrochloride of meta-toluylenediamine (or
equivalent quantities of meta-toluylenediamine and hydrochloric acid requisite to
form the basic hydrochloride of meta-toluylenediamine) are made into a paste with
10 lbs. of alcohol, to which 7.5 lbs. of a solution containing 40% of formaldehyde
are then added. The mixture immediately becomes warm and the reaction is
completed by heating on the water bath for several hours. The reaction product
is treated with hot dilute hydrochloric acid, the solution filtered and the new base
is precipitated as a brown powder by adding a slight excess of ammonia.
The base thus obtained probably has the following formula :-

page_text: colouring matter when dry is a red brown powder which dyes unmordanted cotton
red in an alkaline bath..
The colouring matter when dissolved in concentrated sulphuric acid forms a blue
solution.
II. The combination of one molecule of the tetrazo compound of the new base
above described with two molecules of B-naphthylamine mono-sulphonic acid 2.6
can be effected as in Example I by taking 12-25 lbs. dry ẞ-naphthylamine mono-
sulphonate of soda 2.6 instead of the same quantity of naphthionate of soda.
The dye stuff formed is a red brown powder, when dry, which dyes unmordanted
cotton red in an alkaline bath, and when dissolved in concentrated sulphuric acid
forms a blue solution.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The production of a new diamido base applicable to the manufacture of
substantive cotton dyes by condensation of one molecule of tolidine with one
molecule basic hydrochloride of meta-toluylenediamine and one molecule form-
aldehyde substantially as described.
2.. The diamido base formed from tolidine, formaldehyde and hydrochloride of
meta-toluylenediamine.
3. The manufacture of red substantive cotton dyes by combining one molecule of
the tetrazo compound of the base, produced as stated above from tolidine, form-
aldehyde and meta-toluylenediamine, with two molecules of naphthionic acid 1-4, or
with two molecules of ẞ-naphthylamine mono-sulphonic acid 2-6, substantially as
described.
4. The substantive cotton dyes formed by the combination of the tetrazo
compound of the base herein described with naphthionic acid, or with ẞ-naphthyl-
amine mono-sulphonic acid, as set forth in Examples I and II.
Dated this 31st day of January 1894.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.