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,
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-cresolmethyl ether (obtained by
combining para-uitrodiazobenzene 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 53 kilos. of the
sodium salt of y-amidonaphtholmonosulpho acid in presence of an excess of sodium
acetate.
The colouring matter separates in the shape of a violet black powder. After
stirring for some hours the solution is gently heated and made alkaline and the
dyestuff is precipitated by means of common salt. It dyes unmordanted cotton
blue shades, fast to acid, alkali and light.
The colouring matter in dry state is a black brown powder with metallic lustre,
soluble in cold water, more readily in hot water, with violet blue colour, which is
not altered by the addition of caustic soda lye, an excess of the lye producing a
black violet precipitate. In alcohol or ether the dye is practically insoluble.
From the aqueous solution of the dye the free color acid is immediately
precipitated if mineral acids are added, whilst on addition of acetic acid the
separation is imperfect.
Concentrated sulphuric acid dissolves the colouring matter with blue black colour,
which, on diluting with water, turns at first violet, but, on further diluting, the free
colour acid separates in the shape of black violet flakes.
Dated thie 19th day of October 1894.
ABEL & IMRAY,
Agents for the Applicant.
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 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.

page_text: The following example illustrates the manufacture of this 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
Ditro-amido-azo compound by means of alkali sulphides) or the corresponding
quantity of its sulphate or hydro-chlorate, 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 53 kilos. of the
sodium salt of y-amidonaphtholmonosulpho acid in presence of an excess of sodium
acetate.
The colouring matter separates in the shape of a violet black powder. After
stirring for some hours the solution is gently heated and made alkaline and the
dyestuff is precipitated by means of common salt. It dyes unmordanted cotton
blue shades, fast to acid, alkali and light.
The colouring matter in dry state is a black brown powder with metallic lustre,
soluble in cold water, more readily in hot water, with violet blue colour, which is
not altered by the addition of caustic soda lye, an excess of the lye producing a
black violet precipitate. In alcohol or ether the dye is practically insoluble.
From the aqueous solution of the dye the free colour acid is immediately
precipitated if mineral acids are added, whilst on addition of acetic acid the
separation is imperfect.
Concentrated sulphuric acid dissolves the colouring matter with blue black colour,
which, on diluting with water, turns at first violet, but on further diluting the free
colour acid separates in the shape of black violet flakes.
Having now particularly described and ascertained the nature of the said
invention 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 molecule of tetrazotised para-amido-benzol-azo-amido-para-cresol-
methylether with two molecules of y-amidonaphtolmonosulphonic acid in a weakly
acid solution.
2. The azo colouring matter manufactured as above set forth.