Year: 1898

page_text: I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, Chancery Lane, in the County of London, Consulting Engineer and
Chartered Patent Agent, do hereby declare the nature of this invention (as com-
municated to me from abroad by The Actien-Gesellschaft für Anilin-Fabrika-
tion, in the Empire of Germany, Chemical Manufacturers) to be as follows:-
The invention relates to the production of a new colouring matter by means
of the naphtholsulphamidosulphonic acid described in the German Patent
No. 53934. This acid has already been used for preparing azo-dyes by com-
bining the same with certain diazo-compounds (compare German Patent
No. 57484). As far as is known to my foreign correspondents, the dyestuff's
described in the beforementioned patent have not been produced on a large
scale or been brought into the market. Most probably the reason for this was,
that the red shades obtained with these dyes were either too yellowish or too dull
and did not possess the pure blueish tint, which is necessary for products intended
to be used together with other uniformly dyeing colouring matters.
My foreign correspondents have now discovered that by combining the afore-
said naphtholsulphamidosulphonic acid with the diazo-compound of m-amido-p-
cresol ether a dyestuff may be obtained which dyes wool very clear red shades
of blueish tint; the colouring matter is therefore very well suited for dyeing
uniform shades in mixture with other colouring matters.
In order to produce the new dyestuff 14 kilos. of m-amido-p-cresol methyl
ether (CH, NH, OCH, 1:3:4) are diazotised by means of hydrochloric
acid and nitrite. The solution of the diazo-compound is allowed to run into a
solution of 325 kilos. of the sodium salt of naphtholsulphamidosulphonic acid,
kept alkaline by an excess of carbonate of soda. The mixture is well stirred for
some time and then heated and the colouring matter is precipitated by means
of common salt. The colouring matter thus obtained dyes wool a clear blueish-
red shade in an acidified bath; the shades obtained possess a remarkable fastness
to light.
Datad this 12th law of Tuns 1900

page_text: Chartered Patent Agent, do hereby declare the nature of this invention (as com-
municated to me from abroad by The Actien-Gesellschaft für Anilin-Fabrika-
tion, of Berlin, in the Empire of Germany, Chemical Manufacturers) and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
The invention relates to the production of a new colouring matter by means
of the naphtholsulphamidosulphonic acid described in the German Patent
No. 53934. This acid has already been used for preparing azo-dyes by com-
bining the same with certain diazo-compounds (compare German Patent
No. 57484). As far as is known to my foreign correspondents, the dyestuffs
described in the beforementioned patent have not been produced on a large
scale or been brought into the market. Most probably the reason for this was.
that the red shades obtained with these dyes were either too yellowish or too dull and
did not possess the pure blueish tint, which is necessary for products intended
to be used together with other uniformly dyeing colouring matters.
My foreign correspondents have now discovered that by combining the afore-
said naphtholsulphamidosulphonic acid with the diazo-compound of m-amido-p-
cresol ether a dyestuff may be obtained which dyes wool very clear red shades
of blueish tint: the colouring matter is therefore very well suited for dyeing
uniform shades in mixture with other colouring matters.
=
In order to produce the new dvestuff 14 kilos. of m-amido-p-cresol methyl
ether (CH, NH. : OCH, 1:3:4) are diazotised by means of hydrochloric
acid and nitrite. The solution of the diazo-compound is allowed to run into a
solution of 325 kilos. of the sodium salt of naphtholsulphamidosulphonic acid,
kept alkaline by an excess of carbonate of soda. The mixture is well stirred for
some time and then heated and the colouring matter is precipitated by means
of common salt. The colouring matter thus obtained dyes wool a clear blueish-
red shade in an acidified bath; the shades obtained possess a remarkable fastness
to light.
The dyestuff forms in dry state a dark brown powder of metallic lustre
which dissolves in water with an intense magenta red colour. By addition of
concentrated soda Eye this solution assumes a more vellowish red tint. On addi-
tion of dilute mineral acid to a hot aqueous solution of the dyestuff its acid
crystallises in the shape of needles of bronze lustre. The dyestuff is only sparingly
soluble in alcohol: it dissolves in sulphuric acid with violet colour, on diluting
with water the solution at first is turned red and afterwards a brown precipitate
of metallic lustre is separated.
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 manufacture of a blueish red wool azodyestuff by com-
bining the diazo-compound of meta-amido-para-cresol methyl ether with naph-
thosulphamidosulphonic acid.
2. The dyestuff manufactured as above set forth.