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.
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 :--
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 the colouring matter.
26.5 kilos. of para-amidobenzol-azo-amido-para-cresolmethyl ether (obtained by
combining para-nitrodiazobenzene with amido-para-cresol-ether and reducing the
nitro-amido-azo compound by means of alkali 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 16 kilos. of the sodium salt of salicylic acid in presence of
an excess of soda. After stirring for half an hour the production of the inter-
mediate product is complete and 26 kilos. of the sodium salt of y-amidonaphthol-
monosulpho acid are added.
The solution is agitated for some hours, then gently heated, and the colouring
matter is precipitated by means of common salt.
It dyes unmordanted cotton grey to black shades fast to acid, alkali and light.
The colouring matter may be diazotised on the fibre and combined with toluylen-
diamine, naphthol, amidonaphthol ether and the like.
To wool and silk the dyestuff does not show a great affinity.
The colouring matter in a dry state is a brownish black powder with metallic
lustre, soluble in cold water, more readily in hot water, with dark red violet colour,
which on addition of caustic soda lye turns to red violet, a great excess of the lye
producing a dark blue black precipitate. The colouring matter is to a very small
extent soluble in alcohol with dark violet red colour, it is insoluble in ether.
From the aqueous solution of the colouring matter the free colour acid is
precipitated on addition of mineral acids or acetic acid, in the form of dark
greenish blue flakes. Concentrated sulphuric acid dissolves the dyestuff with dark
blue colour, which, on diluting with water, turns at first into greenish blue, but,
on further diluting, the free colour acid separates in the forin of brown violet
flakes.
Dated this 19th day of October 1894.
ABEL & IMRAY,
Agents for the Applicant.

page_text: Manufacture of Direct Dyeing Colouring mat
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
he 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 the colouring matter.
26.5 kilos. of para-amidobenzol-azo-amido-para-cresolmethyl ether (obtained by
combining para-nitrodiazobenzene with amido-para-cresol-ether and reducing the
nitro-amido-azo compound by means of alkali 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 16 kilos. of the sodium salt of salicylic acid in presence of
an excess of soda. After stirring for half an hour the production of the inter-
mediate product is complete and 26 kilos. of the sodium salt of y-amidonaphthol-
monosulpho acid are added.
The solution is agitated for some hours, then gently heated, and the colouring
matter is precipitated by means of common salt.
It dyes unmordanted cotton grey to black shades fast to acid, alkali and light.
The colouring matter may be diazotised on the fibre and combined with toluylen-
diamine, naphthol, amidonaphthol ether and the like.
To wool and silk the dyestuff does not show a great, affinity.
The colouring matter in a dry state is a brownish black powder with metallic
lustre, soluble in cold water, more readily in hot water, with dark red violet colour,
which on addition of caustic soda lye turns to red violet, a great excess of the lye
-producing a dark blue black precipitate. The colouring matter is to a very small
extent soluble in alcohol with dark violet red colour, it is insoluble in ether.
From the aqueous solution of the colouring matter the free colour acid is
precipitated on addition of mineral acids or acetic acid, in the form of dark
greenish blue flakes. Concentrated sulphuric acid dissolves the dyestuff with dark
blue colour, which, on diluting with water, turns at first into greenish blue, but,
on further diluting, the free colour acid separates in the form of brown violet
flakes..
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 herein described manufacture of a direct dyeing colouring matter by
combining one of the diazo groups of tetrazotised para-amido-benzol-azo-amido
para-cresol-methyl ether with one molecule of salicylic acid, and the other of the
diazo groups with one molecule of y amido naphthol-sulphonic acid.
2. The colouring matter manufactured as above set forth.
ABEL & IMRAY,
Agents for the Applicant.