Manufacture of Basto Colouring Matters.
Year: 1893

page_text: Date of Application, 18th May, 1893
Complete Specification Left, 14th Feb., 1894-Accepted, 17th Mar., 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR ANILIN
FABRIKATION, of Berlin, in the German Empire, Chemical Manufacturers.]
Manufacture of Basto Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, in the
County of London, Consulting Engineer and Chartered Patent Agent, do hereby
declare the uature of this invention to be as follows:-
It
This invention relates to the production of valuable basic colouring matters.
is founded on the observation that the nou-symmetrically mono or dialkylized
paradiamines or their salts yield, when oxidized together in a suitable solvent with
diphenylmetaphenylene diamine or its homologues, violet blue to blue colouring
matters.
The reaction takes place between one molecule of the paradiamine derivative
and one molecule of the substituted metadiamine; the yield of colouring matter
nearly corresponds with the amount theoretically calculated, the products obtained
dye mordanted cotton, wool and silk bright violet blue to blue shades of great
intensity; moreover they are distinguished by their fastness against the action of'
acids, alkalies, air and light.
The following directions show in what manner the invention may be practically
carried out in preparing, for instance, the colouring matter derived from
dimethylparaphenylenediamine : CH. {N(CH), and ditolylmetaphenylendiamine:
NHC,H,
CE. NHCH.
To an alcoholic solution of dimethylparaphenylendiamine hydrochlorate-which
may be obtained by reducing 2.5 kilos. paranitroso-dimethylaniline hydrochlorate
with zinc powder and hydrochloric acid in about 100 litres of alcohol and filtering
after complete reduction from the unattacked zinc powder-2.9 kilos. di-p-tolyl-
metaphenylendiamine are added; after heating to about 70° C. a concentrated
aqueous solution of 3.75 kilos. crystallised sodium bichromate is poured in; the
mixture is kept gently boiling during about one hour; 100 litres of water and
30 litres of a saturated solution of common salt are then added and, after cooling,.
the precipitate is collected on a filter, washed with salt solution and finally with a
small quantity of cold water.
By dissolving in boiling water and filtering, the oxide of chromium is removed
and from the dark violet blue solution the colouring matter is precipitated by
means of salt.
The general character of the dye-stuffs obtained is not materially altered by
substituting in the process described for the dimethylparaphenylendiamine other
equivalent substances such as monoethyl paraphenylendiamine, or by employing
instead of diphenyl-metaphenylendiamine other equivalent metadiamines.
Dated this 18th day of May 1893.
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Manufacture of Basic Colouring Matters.
I, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, 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 production of valuable basic colouring matters. It
is founded on the observation that the non-symmetrically mono or dialkylized
para diamines or their salts yield, when oxidized together in a suitable solvent with
diphenylmetaphenylene diamine or its homologues, violet blue to blue colouring
matters.
The reaction takes place between one molecule of the paradiamine derivative
and one molecule of the substituted meta-diamine, the yield of colouring matter
nearly corresponds with the amount theoretically calculated, the products obtained
dye mordanted cotton, wool and silk bright violet blue to blue shades of great
intensity; moreover they are distinguished by their fastness against the action of
acids, alkalies, air and light.
The following directions show in what manner the invention may be practically
carried out in preparing, for instance, the colouring matter derived from
dimethylparaphenylenediamine: C.H. {N(CH.),
NH,
and ditolylmetaphenylenediamine:
CH. NHCH.
NHC,H,
To an alcoholic solution of dimethylparaphenylenediamine hydrochlorate-which
may be obtained by reducing 2.5 kilos. paranitroso dimethylaniline hydrochlorate
with zinc powder and hydrochloric acid in about 100 litres of alcohol and filtering
after complete reduction from the unattacked zinc powder-2.9 kilos. di-p-tolyl-
metaphenylenediamine are added; after heating to about 70° C. a concentrated
aqueous solution of 3.75 kilos. crystallised sodium bichromate is poured in; the
mixture is kept gently boiling during about one hour, 100 litres of water and
30 litres of a saturated solution of common salt are then added, and, after cooling,
the precipitate is collected on a filter, washed with salt solution and finally with a
small quantity of cold water.
By dissolving in boiling water and filtering, the oxide of chromium is removed
and from the dark violet blue solution the colouring matter is precipitated by
means of salt.
The general character of the dye stuffs obtained is not materially altered by
substituting, in the process described, for the dimethylparaphenylendiamine other
equivalent substances, such as mono-ethyl paraphenylendiamine, or by employing,
instead of diparatolyl-meta-phenylendiamine, other equivalent meta-diamines.
.
Having now particularly described and ascertained the nature of my 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 basic colouring matters by oxidising, in
a suitable solvent by chromates, alkylised derivatives of paraphenylene-diamine
containing one free amido group jointly with di-phenylmetaphenylenediamine or its
equivalent.
2. The colouring matters manufactured as above set forth.
ABEL & IMRAY,
Agents for Applicant.