Improvements in the Manufacture or Production of Azo Colouring Matters.
Year: 1889

page_text: Date of Application, 19th Nov., 1889.
1
omplete Specification Left, 19th Aug., 1890-Accepted, 20th Sept., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture or Production of Azo Colouring
Matters.
I BENJAMIN WILLCOX of 47 Lincoln's Inn Fields in the County of Middlesex Patent
Agent do hereby declare the nature of this invention which has been communicated
to me from abroad by The Farbenfabriken vormals Friedrich Bayer & Co. of Elberfeld
in the Empire of Germany to be as follows:-
It is known that colouring matters of from yellow red to blue red colour can be
obtained by the action of the diazo combinations of amines and of their sulpho acids
upon naphthol sulpho acids.
My foreign correspondents have now discovered that by employing in place of the
aforesaid naphthol sulpho acids a dioxynaphthaline sulpho acid such as is obtained by
melting the naphthol disulpho acids with caustic alkalies or by preference the dioxy
naphthaline sulpho acid (corresponding to alpha naphthol disulpho acid) much bluer
colours are obtained which are of considerable value. With diazoanisol for example
and this dioxynaphthaline sulpho acid a dve is obtained resembling acid fuchsine as
regards colour and clearness. The homologues and sulpho acids of aniline produce
blue red dyes. Anisidines produce somewhat bluer dyes and nitraniline forms redder
products. The colouring matters which are derived from the diazo combinations of
the alpha naphthaline group are of a pure blue violet colour, those of the beta
naphthaline group are blue red.
For the purposes of this invention the following amines may be employed for
example aniline, toluidine, xylidine, cumidine, amido phenol, anisidine, cresidine m
and p nitranaline, nitro toluidine, nitro xylidine, sulphanilic acid, toluidine sulpho acid,
xylidine sulpho acid, toluidine disulpho acid, alpha naphthylamine, beta naphthylamine
alpha naphthylamine mono- and di-sulpho acid and beta naphthylamine mono aud
disulpho acid.
In manufacturing these new colouring matters the diazo combinations of the amines
are allowed to run into solutions of the dioxynaphthaline sulpho acids maintained
alkaline by soda and treating the products in the usual manner.
Datad this 10th day of November 1880
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in the Manufacture or Production of Azo Colouring
Matters.
1 BENJAMIN WILLCOX of 47 Lincoln's Inn Fields in the County of Middlesex
Patent Agent do hereby declare the nature of this invention which has been
communicated to me from abroad by Farbenfabriken vormals Friedrich Bayer & Co.
of Elberfeld in the Empire of Germany and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement:
It is known that colouring matters of from yellow-red to blue-red colour can be
obtained by the action of the diazo combinations of amines and of their sulpho- or
carboxy-acids upon nap! thol-sulpho-acids.
My foreign correspondents have now discovered that by employing in place of the
aforesaid naphthol-sulpho or carboxy-acids the dihydroxynaphthalene-mono-sulpho-
acid-S the production of which is described in the Specification of Letters Patent
No. 136659 and which is obtained by melting the alpha-naphtholdisulpho-acid-$ with

page_text: caustic alkalies, much bluer colours are obtained which are of considerable value.
With diazo-toluene for example and this dihydroxynaphthalene mono-sulpho-acid-S a
dyestuff is obtained resembling acid magenta as regards colour and clearness.
The homologues and the sulpho- or carboxy-acids of aniline or their homologues
produce similar blue-red colours.
Anisidines produce somewhat bluer dyes and nitraniline forms redder products. The
colouring matters from the diazo compounds of the naphthylamines are of a pure
blue-violet colour.
acid.
For the purposes of this invention the following amines may for example be employed
aniline, toluidine, xylidine, cumidine, anisidine, cresidine, meta- and para-nitraniline,
nitro-toluidine, nitro xylidine, sulphanilic acid, toluidine-sulpho-acid, xylidine-sulpho-
acid, toluidine-disulpho-acid, alpha-naphthylamine, beta-naphthylamine, alpha-
naphthylamine-mono- or disulpho-acid, and beta-naphthylamine-mono- or disulpho
In manufacturing these new colouring matters the diazo combinations of the amines
or their sulpho- or carboxy-acids are allowed to run into an acetic acid solution of the
dihydroxy-naphthalene-sulpho-acid and the product so obtained is treated in the usual
manner. The chemical reaction takes place between molecular proportions. For one
molecule of an amine, one molecule of the dihydroxynaphthalene-sulpho-acid-S is
necessary. Instead of an acetic acid solution of the dihydroxynaphthalene-sulpho-acid
alkaline solutions may be employed but then the colours are not so bright.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. The production of colouring matters by combining the diazo compounds of
amines, or their sulpho- or carboxy-acids with the dihydroxynaphthalene-mono sulpho
acid-S described in the Specification of Letters Patent No. 1366589.
2: As new articles of manufacture the colouring matters hereinbefore described.
1000