Manufacture of a Colouring Matter to Dye Cotton without Mordant.
Year: 1894

page_text: Date of Application, 12th Oct., 1394
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 a Colouring Matter to Dye Cotton without
Mordant.
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 tetrazoic colouring matter producing
Fibre
intense dark blue tints on unmordanted cotton in an alkaline or salt bath.
thus treated may be farther subjected to treatment with acid solution of sodium
nitrite and subsequent developrnent by phenols or amines in slightly acid solution.
The tints thus produced are still deeper and are distinguished by their intensity
and solidity.
The new colouring matter is obtained by the reaction of two molecules of
y-amidonaphthol sulphonate of soda in alkaline solution on one molecule of a
tetrazotised ether of para amido-benzene azoamido-para-cresol.
This base may itself be prepared by combination of para-nitro-diazobenzene with
para-amidocresylic ether and reduction of the resulting azo compound by means of
alkaline sulphides.
=
:
The base derived from methylic ether of para-amido-cresol (CH, OCH:
NH, 1:4: 3) when dry is a brownish yellow powder, melting at 115° C., easily
soluble in alcohol and benzene with yellow colour, and soluble in hydrochloric acid
with deep red colour.
The manufacture of the new colouring matter may be thus effected.
26 kilos. of the methylic ether of para-amidobenzene azo-amido-para-cresol or
the corresponding quantity of sulphate or hydrochlorate are dissolved in water
with 60 kilos. of hydrochloric acid and diazotised in the usual way by adding
14 kilos. of sodium nitrite.
The brownish solution of the azo compound is added to a solution of 50 kilos.
y-amido naphthol sulphonic acid and 60 kilos. of carbonate of soda. The colouring
matter separates as a black precipitate; the liquid is slowly heated for some time
and filtered, and the residue is collected and dried.
The new colouring matter is a dark brown powder not easily soluble in cold
water, more easily soluble in hot water with an indigo blue colour, which does not
change on adding caustic soda; an excess of this produces a deep blue precipitate
of the colouring matter.
From a solution in water the colouring matter is precipitated as a free acid by
mineral acids, more slowly by acetic acid. The colouring matter is insoluble in
alcohol and ether; its solution in concentrated sulphuric acid has a blackish blue
colour which changes to indigo blue and then to violet, depositing the colouring
matter on adding water.
Dated this 12th day of October 1894.
ABEL & IMKAY,
Agents for the Applicant.

page_text: Manufacture of a Colouring Matter to Dye Cotton without
Mordant:
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 tetrazoic colouring matter
producing intense dark blue tints on unmordanted cotton in an alkaline or salt
bath. Fibre thus treated may be farther subjected to treatment with acid' solution
of sodium nitrite and subsequent development by phenols or amines in slightly acid
solution.
The tints thus produced are still deeper and are distinguished by their intensity
and solidity.
The new colouring matter is obtained by the reaction of two molecules of
y-amidonaphthol sulphonate of soda in alkaline solution on one molecule of a
tetrazotised ether of para-amidobenzene azoämido-para-cresol.
This base may itself be prepared by combination of para-nitro-diazobenzene with
para-amidocresylic ether and reduction of the resulting azo compound by means of
alkaline sulphides.
=
:
The base derived from methylic ether of para-amido-cresol (CH, OCH,:
NH, 1:43) when dry is a brownish yellow powder, melting at 115° C., easily
soluble in alcoliol and benzene with yellow colour, and soluble in hydrochloric acid
with deep red colour.
The mauufacture of the new colouring matter may be thus effected.
26 kilos. of the methylic ether of para-amidobenzene azo-amido-para-cresol or
the corresponding quantity of sulphate or hydrochlorate are dissolved in water
with 60 kilos. of hydrochloric acid and diazotised in the usual way by adding
14 kilos. of sodium nitrite.
The brownish solution of the azo compound is added to a solution of 50 kilos.
y-amido naphthol sulphonic acid and 60 kilos. of carbonate of soda. The colouring
matter separates as a black precipitate; the liquid is slowly heated for some time
and filtered, and the residue is collected and dried.
The new colouring matter is a dark brown powder not easily soluble in cold
water, more easily soluble in hot water with an indigo blue colour, which does not
change on adding caustic soda; an excess of this produces a deep blue precipitate
of the colouring matter.
From a solution in water the colouring matter is precipitated as a free acid by
mineral acids, more slowly by acetic acid. The colouring matter is insoluble in
alcohol and ether; its solution in concentrated sulphuric acid has a blackish blue
colour which changes to indigo blue and then to violet, depositing the colouring
matter on adding water.
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 molecule of tetrazotised para-amido-benzol-azo-amido-para-cresol

page_text: methyl ether with two molecules of y amido naphthol monosulphonic acid in
alkaline solution.
2. The azo colouring matter manufactured as above set forth.
ABEL & IMKAY,
Agents for the Applicant.