Improvements in the Manufacture of Azo Colouring Matters.
Year: 1895

page_text: Date of Application, 28th June, 1895
Complete Specification Left, 11th Mar., 1896-Accepted, 11th Apr.. 1896
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR ANILIN
FABRIKATION, of Berlin, in the Empire of Germany, Chemical
Manufacturers.]
Improvements in the Manufacture of Azo Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery Lane,
in the County of London, Consulting Engineer and Chartered Patent Agent, do
hereby declare the nature of this invention to be as follows:-
In the Specification No. 7859 of 1894, I have described as communicated to me
by my foreign correspondents a process for manufacturing azo-dyestuffs derived
from the alpha, alpha-amido-naphthol-alpha-beta-disulpho acid. The examples
given in the said Specification only comprise such colouring matters as are prepared
from diazo compounds and the acid mentioned in equi-molecular proportions.
In the present Specification as communicated by my foreign correspondents
I describe colouring matters, the formation of which is based upon the capability
which the acid above mentioned possesses of uniting with two molecular proportions
of diazo compounds and thus giving rise to dye stuffs of the following general
constitution formula :

page_text: Colouring matters dyeing the fibre with a similar tint have been obtained by the
action of equi molecular proportions of diazo naphthaline and diazobenzene
sulphonic acid upon the acid in question. By uniting this amidonaphthol-
disulphonic acid on the one hand with the intermediate product prepared from
tetrazo-diphenyl and one molecule of salicylic acid and on the other hand with
diazo benzene sulphonic acid, a direct dyeing colouring matter of a greenish grey
shade is obtained.
Dad thin both day of June 1895
ABEL & IMRAY,
Agents for the Applicant.
Improvements in the Manufacture of Azo Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery Lane,
in the County of London, Consulting Engineer and Chartered 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 :-
In the Specification No. 7859 of 1894, I have described as communicated to me
by my foreign correspondents a process for manufacturing azo-dyestuffs derived
from the alpha, alpha-amido-naphthol-alpha,-beta,-disulpho acid. The examples
given in the said Specification only comprise such colouring matters as are prepared
from diazo compounds and the acid mentioned in equi-molecular proportions.
In the present Specification as communicated by my foreign correspondents
I describe colouring matters, the formation of which is based upon the capability
which the acid above mentioned possesses of uniting with two molecular proportions
of diazo compounds and thus giving rise to dyestuffs of the following general
constitution formula:
EXAMPLE 1.
The solution of the diazo-compound obtained in the usual way from 13.8 kilos.
of para-nitraniline is allowed to flow into the solution of 31.9 kilos. of alpha-
alpha-amido-naphthol-alpha,-beta, disulpho-acid in presence of hydrochloric acid.

page_text: The product of combination, when completely formed, is couverted into the
sodium salt by carbonate of soda and the solution of 13-8 kilos. more of para
nitraniline is added, care being taken that carbonate of soda should be present in
sufficient quantity to keep the solution alkaline till the end of the reaction. The
colouring matter thus formed is isolated in the usual way. It forms a blackish
brown powder with a metallic lustre soluble in water with a greenish black colour.
It dyes the fibre greyish-black shades.
EXAMPLE II.
14.3 kilos. of alpha-naphthylamine are diazotised in the usual way and the
solution thus obtained is poured into the solution, to which acetate of soda has
been added of 34-1 kilos. of the acid sodium salt of the alpha-alpha-amidonaphthol--
alpha,-beta,-disulphonic acid. The product of combination is converted into the
sodium salt by carbonate of soda. The diazo derivative of 17.3 kilos. of
sulphanilic acid is then added, care being taken that the solution is kept alkaline
by means of carbonate of soda till the end of the reaction.
The dyestuff thus formed is isolated in the usual way. It dyes wool black
shades.
EXAMPLE III.
The diazo derivative of 173 kilos. of sulphanilic acid is allowed to flow into the
solution to which sodium acetate has been added of 31.9 kilos. of the sodium salt
of alpha-alpha-amidonaphthol-alpha-beta-disulphonic acid. The combination
being completed, the solution is rendered and kept alkaline by carbonate of soda
and the intermediate product obtained by combining 18-4 kilos. of tetrazotised
benzidine with 13-8 kilos. of salicylic acid is added. The combination takes place
readily. The colouring matter is isolated in the usual way. It dyes unmordanted
cotton greenish grey shades.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The herein described manufacture of azo colouring matters by combining one
molecular proportion of the alpha,-alpha-amidonaphthol alpha,-beta,-disulphonic
acid with two molecular proportions of diazo derivatives, equal or different from.
each other.
2. The colouring matters manufactured as above set forth.
ABEL & IMRAY,
Agents for the Applicant.