Improvements in the Manufacture of Colouring Matters Dyeing Blue with Mordants.
Year: 1894

page_text: Date of Application, 21st May, 1894
Complete Specification Left, 6th Feb., 1895-Accepted, 9th Mar., 1895
PROVISIONAL SPECIFICATION
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR ANILIN
FABRIKATION, of Berlin, in the Empire of Germany, Chemical
Manufacturers.]
Improvements in the Manufacture of Colouring Matters Dyeing Blue
with Mordants.
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:-
My foreign correspondents, having previously discovered that colouring matters
can be produced by condensation of orthochinones or their sulpho-acids with
alkyl-para-phenyldiamines and by treatment of the resulting condensation products
with sulphur and with fuming sulphuric acid, have farther discovered that, for the
alkyl-para-phenyldiamines, may be substituted their sulpho acids in which the
position of the sulpho group is such that the reaction between the chinone compound
and the diamine compound can take place in a similar manner.
The sulpho-acids which it is preferable to employ for this purpose are such as
those of ethyl benzyl-para-phenylen-diamine or methyl beuzyl-para-phenylen-
diamine.
Dated this 21st day of May 1894.
ABEL & IMRAY,
Agents for the Applicant.
Improvements in the Manufacture of Colouring Matters Dyeing Blue
with Mordants.
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:
My foreign correspondents having previously discovered that colouring matters
can be produced by condensation of orthochinones or their sulpho acids with
alkyl-para-phenyldiamines and by treatment of the resulting condensation products
with sulphur and with fuming sulphuric acid, have farther discovered that, for the
alkyl-para-phenyldiamines may be substituted their sulpho acids in which the
position of the sulpho group is such that the reaction between the chinone compound
and the diamine compound can take place in a similar manner.
The sulpho acids which it is preferable to employ for this purpose are such as
those of ethyl benzyl-para-phenylen-diamine or methyl benzyl-para-phenylen-
diamine.

page_text: .
The following is an example of the manufacture of these colouring matters.
To an alkaline solution of benzyl ethyl-paraphenylendiamine sulpho acid, obtained
by nitrosation and subsequent reduction of 19 kilos. of benzylethylanilinsulpho acid,
27-6 kilos. of the potassium salt of the a B₁ naphthochinone a, monosulpho acid
are added under agitation.
The condensation product thus formed thereby is completely precipitated' by
addition of common salt, the precipitate is filtered off and dried.
It forms a blue powder, which dissolves in water with a violet colour, changing
into yellow on addition of hydrochloric acid.
The transformation of this condensation product into the blue dyestuff may be
effected in the following manner:
20 kilos. of the product and 4 kilos. of flowers of sulphur are dissolved
in 160 kilos. of fuming sulphuric acid, containing about 23 per cent. of anhydride.
The mixture is well stirred and heated to about 40°-50° C. for about 4 to 6 hours.
The whole liquid is poured into water and ice and the solution is gently
heated.
The precipitate is separated by filtration and afterwards dissolved in diluted
soda solution. The solution is filtered off in order to remove the sulphur, and the
colouring matter is then precipitated by means of common salt. It dyes wool
mordanted with chromium a blue shade, fast to light, acids and alkalies.
In the above described process for the a₁ B, naphthochinone a, monosulpho acid
may be substituted other a ẞi naphthochinone sulpho derivatives.
1 Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The herein described process for the production of condensation products by
the action of ortho-naphthochinone or the sulpho acids thereof upon the sulpho
acids of the mono or dialkylised derivatives of paraphenylenediamine or its
homologues containing one free amido group.
2. The herein described process for the transformation of the products obtained
as set forth in the preceding claim into blue mordant dyeing colouring matters by
heating these products with sulphur in presence of fuming sulphuric acid.
3. The condensation products manufactured as set forth in Claim 1.
4. The colouring matters manufactured as set forth in Claim 2.
.
1005
ABEL & IMRAY,
Agents for the Applicant.