Year: 1897

page_text: Date of Application, 28th June, 1897
H
Complete Specification Left, 28th Mar., 1898-Accepted, 11th June, 1898
EXAMPLE.
Tetrazodiphenyl is combined in acid solution with 1 mol. of 17 naphthyl-
aminesulphonic acid; the intermediate product obtained is rediazotised and
combined in alkaline solution with 1 mol. of gamma-amidonaphtolaulphonic
acid or, amidonaphtholdisulphonic acid H. The interinediary product obtained at
this second stage is mixed with 1 mol. of the amidoazo compound produced by
combining, diazotised. gamina-amidonaphtolsulphonic acid with itself in alkaline
solution.

page_text: EXAMPLE.
A tetrazo dimethoxydiphenyl solution is made alkaline by adding to it a
solution of carbonate of soda and next a mol. of 14 naphthol sulphonate of soda
added: The intermediate product obtained is finally introduced into the alkaline
solution of 1 mol. of the amidoazo compound obtained by combining diazotised amido-
azo compound obtained by combining diazotised gamma amidonaphtholsulphonic
acid with amidonaphtholdisulphonic acid H in alkaline solution. The mixture is
stirred for some time and finally heated to 50° C. The colouring matter produced
dyes cotton reddish blue.
EXAMPLE.
Tetrazodiphenyl is combined with 1 mol of 17 naphthylamine sulphonic
acid and the intermediate product obtained rediazotised with 1 mol. of sodium
nitrite. The tetrazo compound obtained is next introduced into the alkaline
solution of 1 mol. of amidonaphthol sulphonic acid G and as soon as the combination
is completed there is added one mol. of the azo compound obtained by combining
diazotised gamma-amidonaphtholsulphonic acid with 14 naphthol sulphonic acid in
alkaline solution.
WILLIAM HENRY CLAUS.
ALFRED REE.
LEON MARCHLEWSKI.

page_text: Production of New Polyazo Colouring Matters.
WILLIAM HENRY CLAUS and ALFRED REE, both Chemical Manufacturers, of Clayton,
Manchester, and LEON MARCULEWSKI, Chemist, of 25, Wellington Street, Higher
Broughton, Manchester, do heroby 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 :-
In our British Patents Nos. 18020 and 4369/97 we described colouring matters
derived from amidoazo compounds, obtained by combining diazotised gamma-
amidonaphthol sulphonic acid with the same acid or with amidonaphtholdisulphonic
acid in alkaline or acid solution. The present invention relates to similar colouring
matters dyeing cotton blue.
These new colouring matters are constituted according to the general
in which P. represents paradiamines of the benzidine series, or paraphenylenediamine;
15 N. naphtholsulpho acids; G. gamma-amiḍonaphtholsulphonic acid; and H.
amidonaphtholdisulphonic acid of the constitution :
EXAMPLE.
24.4 parts of dianisidine are tetrazotised in the well-known manner, and
the acid solution quickly poured into an alkaline solution of 224 parts of
1.4 naphtholsulphonic acid. The intermediate product obtained, which still contains a
free diazo-group, is finally introduced into the alkaline solution of 57 parts of the
amidoazo compound obtained, for instance, by combining the diazo compound of
23.9 parts of gamma-amidonaphtholsulphonic acid with 319 parts of amidonaphthol-
disulphonio Boid H in alkaline solution. The mixture is stirred for some time at
ordinary temperature, and then the latter is gradually raised to 60° C. The colouring
matter obtained dyes cotton blue.
By substituting the dianisidine of the foregoing example by 21'2 parts of
tolidine, or 18-4 parts of benzidine, colouring matters dyeing cotton reddish-blue are
obtained. The benzidine base may be substituted by paraphenylenediamine, in which
case the following method is used:
16 parts of para-diazoacetanilide are combined in alkaline solution with
22.4 parts of 1.4 naplitholsulphonic acid. The red azo compound obtained is next
boiled with caustic soda in order to split off the acetyl group, when p-amido-benzene-
azo-naphtholsulphonic acid will be obtained:
The red alkaline mixture is acidulated with hydrochloric acid, the colour
precipitated completely by adding salt, and filtered off. The collected colour is next
mixed with water, hydrochloric acid added, and diazotised by adding a solution of
7 parts of sodium nitrite. The diazo compound.obtained is finally introduced into
the alkaline solution of 59 parts of the amidoazo compound obtained, for instance,
by combining the diazo compound of 23:9 parts of gamma-amido-naphtholsulphonic
acid with 319 parts of amido-naphtholdisulphonic acid H in alkaline solution. The

page_text: mixture is stirred for some time at ordinary temperature, and then the temperature
is gradually raised to 50-60° C. The colour produced dyes cotton greenish-blue.
Having now particularly described and ascertained the nature of our inven-
tion, and in what manner the same is to be performed; we declare that what we
claim is
7
1. The production of new triakisazo dyes by combining 1 mol: of a tetrazotised
paradiamine, such, as benzidine, tolidine, dianisidine, methoxybenzidine, or diazotised
p-amido-acetanilide with 1 mol. of a naphtholsulphonic acid, and then (in case of
amido-acetanilide after splitting off the acetyl group and diazotising again) with
1 mol, of the ortho-hydroxyazo compound of the following constitution: alpha-
naphthol-beta-sulphonic acid-beta,-azo-alpha,-naphthol-alpha,-amido-beta-beta-
disulphonic acid.
2. The new colouring matters.
1