in the benzidine and Diamidodibenzyltolidine.
Year: 1889

page_text: [Communicated from abroad by Messis DAHL AND COMPANY, of Barmen,
Kingdom of Prussia, Manufacturing Chemists.]
in the
benzidine and Diamidodibenzyltolidine.
ADOLF BANG of Park Row Leeds in the County of York, dye-merchant,
do hereby declare the nature of this invention and in what manner the same
1s to be performed, to be particularly described and ascertained in and by
the following statement
Diamidodibenzylbenzidine and diamidodibenzyltolidine, like benzidine and tolidine,
may be converted into the tetrazo-derivatives by means of nitrous acid. These
tetrazo-derivatives together with amines, phenols, naphthols and their sulpho-acids
(on the reaction generally known having taken place) produce azo colouring
matters.
My communicators have succeeded in the production of tecanically valuable
colouring matters by the combination of tetrazo-dibenzylbenzidine and tetrazo-diben-
zyltolidine with a-naphthylamine-sulpho acid, -naphthylamine-6-sulpho acid, -naph-
thylamine-S-sulpho acid and a mixture of a-naphthylamine-sulpho acid and ẞ-naph-
thylamine-sulpho acid The combinations with a-naphthylamine-sulpho acid dye a
blue red; those with ẞ-naphthylamine-ẞ sulpho acid dye orange, those with B-naph
thylamine- sulpho-acid dye blue red; and those with a mixture of a-naphthylamine
sulpho acid and ẞ-naphthy lamme-ẞ sulpho acid dye scarlet
For example, 394 kilogrammes of diamidodibenzylbenzidine, or a corresponding
quantity of a salt of the same, are diazotised with 60 kilogrammes of hydrochloric
acid and 14 kilogrammes of nitrite of sodium, and the tetrazo derivatives are treated
with a solution of 488 kilogrammes of a-naphthylamine sulphonate of sodium and
40 kilogrammes of acetate of sodium
After standing for 8 days at the ordinary temperature, the formation of the
colouring matter will be completed, and the mixture must be neutralized with soda,
precipitated by means of salt, pressed and dried.

page_text: A mixed colouring matter may be obtained in the following manner
42.2 kilogrammes of diamidodibenzyltolidine are diazotised with 60 kilogrammes
of hydrochloric acid and 14 kilogiammes of nitrite of sodium and added slowly to a
solution of 24.4 kilogrammes of a-naphthylamine sulphonate of sodium and 40 kilo-
grammes of acetate of sodium As soon as the formation of the intermediate product
is completed (after from 1 to 1 hour) a solution of 24 4 kilogrammes of B-naphthyl-
amine-6-sulphonate of sodium must be added and the mixture allowed to stand
8 days, being frequently stirred during this period. The colouring matter must then
be prepared in the usual manner
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 15:
1° The production of Azo-dye stufts or colouring matters from Tetrazodibenzyl-
benzidine and Tetrazodibenzyltolidine by combining Tetra zodibenzylbenzidine and
Tetrazodibenzyltolidine with Amines, Phenols, Naphthols and their sulpho acids.
2° The use of Azo-dye stuffs or colouring matters obtained by combining Tetrazo-
dibenzylbenzidine and Tetra/odibenzyltolidine with Amines, Phenols, Naphthols and
their sulpho acids.