Improvements in the Manufacture of Colouring Matters.
Year: 1892

page_text: Date of Application, 6th Apr., 1892
Complete Specification Left, 24th Dec., 1892-Accepted, 11th Feb., 1893
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR ANILIN
FABRIKATION, of Berlin, in the Empire of Germany, Chemical Manu-
facturers.]
Improvements in the Manufacture of Colouring Matters.
1, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery Lane,
in the County of London, Chartered Patent Agent, do hereby declare the nature
of this invention to be as follows:-
This invention relates to certain improvements in the production of azo dye
stuffs, connected with the inventions described in the Provisional Specifications
No. 277 of 1892 and No. 2408 of 1892.
In these Specifications colouring matters have been described, which are derived
from p-amidobenzene azo amido-a naphthaline by combining the tetrazo
compound thereof with an amine, phenole amido phenole or their sulpho or carbo
acids, or from the oxyethers of this base, by combining therewith the sulpho acids
of a and naphthol, a and ẞ naphthylamine, the amido naphthols and the
dioxynaphthalines.
My foreign correspondents have now discovered that the before mentioned
diamido bases are gradually diazotised by the action of nitrous acid in such
manner, that at first only one of the two amido groups is transformed into a diazo
group.
The diazo body obtained in this way may afterwards be combined with one
molecule of the sulpho acids of amines, phenoles or amidophenoles, the colouring
matters resulting from these combinations dye unmordanted cotton in an alkaline or
salt bath and can also be fixed on wool in a dye bath containing some salt; they
possess for the most part a remarkable resistance against the action of light, air
and soap and are further distinguished by a great intensity.
The preparation of these colouring matters is generally carried out in the
following manner.
One molecule of p-amido benzene azo amido a naphthaline, or of the oxy ethers.
of this base, is dissolved in diluted hydrochloric acid and diazotised by the action
of one molecule of nitrite. The diazo compound, which forms a red orange solution
is afterwards combined with one molecule of the said sulpho acids, the combination
being performed according to the nature of the sulpho compounds employed either
in alkaline solution or in the presence of acetic acid.
The sulpho acids of the naphtholes and dioxynaphthalenes yield violet blue to
greenish blue colours; the dye stuffs obtained with the naphthylamine sulpho acids
are brownish violet; those derived from the amido naphtholsulpho acids are blue
black:
Dated this 6th day of April 1892
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Colouring Matters.
I, CHARLES DENTON ABEL of No. 28 Southampton Buildings, Chancery Lane
in the County of London, 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 :-
This invention relates to certain improvements in the production of azo dye
Price

page_text: stuffs, connected with the inventions described in the Specifications No. 277 of 1892
and No. 2408 of 1892.
In these Specifications colouring matters have been described, which are
derived from p-amidobenzene-azo-amido-a-naphthaline by combining the tetrazo
compound thereof with an amine, phenole, amido pheuole or their sulpho or carbo
acids, or from the oxy-ethers of this base, by combining therewith the sulpho
acids of a and ẞ naphthol, a and ẞ naphthylamine, the amido naphthols and the
dioxynaphthalines.
My foreign correspondents have now discovered that the before mentioned
diamido bases may be gradually diazotised by the action of nitrous acid in such
manner, that at first only one of the two amido groups is transformed into a diazo
group.
The diazo body obtained in this way may afterwards be combined with one
molecule of the sulpho acids of amines, phenoles or amidophenoles; the colouring
matters resulting from these combinatious dye unmordanted cotton in an alkaline or
salt bath and can also be fixed on wool in a dye bath containing some salt; they
possess for the most part a remarkable resistance against the action of light, air and
soap and are further distinguished by a great intensity.
The preparation of these colouring matters is generally carried out in the
following manner.
One molecule of p-amido benzene azo amido a naphthaline or of the oxy-ethers
of this base is dissolved in diluted hydrochloric acid and diazotised by the action of
one molecule of nitrite. The diazo compound is afterwards combined with one
molecule of the said sulpho acids, the combination being performed according to
the nature of the sulpho compounds employed either in alkaline solution or in the
presence of acetic acid.
Example: 26 kgs. p-amidobenzene-azo-amido-a-naphthaline (or the equivalent
quantity of the oxy-ethers of this base as mentioned in the Specification No. 2408
of 1892) are dissolved in diluted hydrochloric acid and diazotised by the action of
a solution of 7 kgs. nitrite of soda.
The deep orange coloured solution of the diazo compound is poured into an
alkaline solution of 34.8 kgs. sodium salt of ẞ naphtholdisulpho acid R. A dark
blue precipitate separates immediately; after stirring for some time the mixture is
gently heated and the colouring matter is salted out. It dyes unmordanted cotton
in an alkaline or salt bath greyish violet blue, and can be fixed with the same shade
on wool in a dye bath containing salt.
If in the aforesaid example for the 3 naphtholdisulpho acid R, are substituted
the other sulpho acids of ẞ naphthol, the sulpho acids of a naphthol or the dioxy-
naphthaline sulpho acids similar colouring matters of violet blue to greenish blue
shades are obtained; the dye stuffs with naphthylamine-sulpho acids are brownish-
violet colouring matters, those derived from amidonaphtholsulpho-acids are blue
black.
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 herein described process for the production of azo colouring matters by
combining the diazo-compound obtained from the action of one molecule of nitrite
upon one molecule of p-amidobenzene-azo-amido-a-naphthaline (or the oxy-
ethers of this base described in the Specification No. 2408 of 1892) with the sulpho
acids of a or ẞ naphthol, a or ẞ naphthylamine, amidonaphtholsulpho acids or
dioxynaphthalene sulpho acids.
2. The colouring matters manufactured as set forth in the preceding claim.
Dated this 24th day of December 1809