Manufacture of Direct Dyeing Colouring Matter.
Year: 1894

page_text: Date of Application, 19th Oct., 1894
Complete Specification Left, 5th July, 1895-Accepted, 10th Aug., 1895
PROVISIONAL SPECIFICATION.
Communicated from abroad by THE ACTIEN GESELLSCHAFT (FÜR ANILIN
FABRIKATION, of Berlin, in the Empire of Germany, Chemical (Manu-
facturers.]
Manufacture of Direct Dyeing Colouring Matter.
1, 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:-
This invention relates to the manufacture of a new trisazo-colouring matter,.
which has properties of high technical value.
The following example illustrates the manufacture of this colouring matter.
26.5 kilos. of para-amidobenzol-azo-amido-para-cresolmethylether, (obtained by
combining para-nitrodiazobenzene with amido-para-cresolether and reducing the
nitro-amido-azo-compound by means of alkaline sulphides,) or the corresponding
quantity of its sulphate or hydrochlorate, are transformed by nitrite, in the well
known manner, into the tetrazo body. The yellow-brown solution thus obtained is
added to a solution of 26 kilos. of the sodium salt of a-naphthylamine-ẞ,-sulpho
When the formation of
acid (Cleve) in presence of an excess of sodium acetate.
the intermediate product is complete, a soda alkaline solution of 26 kilos. of
y-amidonaphtholmonosulpho acid is added.
The colouring matter is separated in the well known manner.
It dyes unmordanted cotton deep violet-black shades, the bright tints are violet-
grey. The colouring matter may be diazotised on the fibre and combined with
toluylendiamine or amidonaphthol-ether and yields blue-black shades of great
fastness. For the a-naphthylamine-ß-monosulpho acid may be substituted with
the same technical result the a-naphthylamine-ß-monosulpho acid, or a mixture
of the two isoneric acids.
The colouring matter in a dry state is a brownish-black powder of metallic
lustre, soluble in cold water, more readily in hot water, with a violet blue colour,
which, on addition of caustic soda lye, is scarcely altered, an excess of the lye
producing a dark violet precipitate. In alcohol the colouring-matter is only very
From the
sparingly soluble with violet-blue colour, in ether it is insoluble.
aqueous solution of the colouring-matter the free colour-acid is precipitated on
addition of mineral acids or of acetic acid, in the form of a dark indigo blue
precipitate. Concentrated sulphuric acid dissolves the colouring matter with dark
indigo blue colour, which, on diluting with water, turns at first into bright-blue,
then into violet, and finally the free-colour acid separates in the form of violet
flakes.
Dated this 10th day of October 1894.
ABEL & IMRAY,
Agents for the Applicant.

page_text: Manufacture of Direct Dyeing Colouring Matter.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery
Lane, in the County of London, Consulting Engineer, do hereby declare the
Dature 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 trisazo-colouring matter,
which has properties of high technical value.
The following example illustrates the manufacture of this colouring matter.
26.5 kilos. of para-amidobenzol-azo-amido-para-cresol methylether, (obtained by
combining para-nitrodiazobenzene with amido-para-cresol ether and reducing the
nitro-amido-azo-compound by means of alkaline sulphides) or the corresponding
quantity of its sulphate or hydrochlorate, are transformed by nitrite, in the well
known manner into the tetrazo body. The yellow brown solution thus obtained is
.added to a solution of 26 kilos. of the sodium salt of a-naphthylamine-ẞa-sulpho
acid (Cleve) in presence of an excess of sodium acetate. When the formation of
the intermediate product is complete, a soda alkaline solution of 26 kilos. of
y-amidonaphtholmonosulpho acid is added.
The colouring matter is separated in the well known manner.
It dyes unmordanted cotton deep violet black shades, the bright tints are violet-
grey. The colouring matter may be diazotised on the fibre and combined with
toluylendiamine or amidonaphtholether and yields blue-black shades of great
fastness. For the a₁-naphthylamine-ß,-monosulpho acid may be substituted with
the same technical result the a₁-naphthylamine-3-monosulpho acid, or a mixture
of the two isomeric acids.
The colouring matter in a dry state is a brownish-black powder of metallic
lustre, soluble in cold water, more readily in hot water, with a violet blue colour,
which, on addition of caustic soda lye, is scarcely altered, an excess of the lye
producing a dark violet precipitate. In alcohol the colouring matter is only very
sparingly soluble with violet-blue colour, in ether it is insoluble. From the
aqueous solution of the colouring matter the free colour acid is precipitated on
addition of mineral acids or of acetic acid, in the form of a dark indigo blue
precipitate. Concentrated sulphuric acid dissolves the colouring matter with dark
indigo blue colour, which, on diluting with water, turns at first into bright blue,
then into violet, and finally the free colour acid separates in the form of violet
.flakes.
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 manufacture of direct dyeing colouring matter by
combining one of the diazo groups of tetrazotised para-amido-benzol-azo-amido-
para-cresolmethylether with one molecule of a₁-naphthylamine B, sulphonic acid
(Cleve) and the other of the diazo groups with one molecule of y amidonaphthol-
sulphonic acid.
2. The colouring matter manufactured as above set forth.
CTI
1002
ABEL & IMRAY,
Agents for Applicant.