Production on the Fibre by the Aid of P. Amidodiphenylamine of Dye-stuffs Fast to Light and Washing.
Year: 1893

page_text: Date of Application, 2nd Mar., 1893
Complete Specification Left. 1st Dec., 1893-Accepted, 6th Jan., 1894
PROVISIONAL SPECIFICATION.
The Production on the Fibre by the Aid of P. Amidodiphenylamine
of Dye-stuffs Fast to Light and Washing.
1, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman, (a com-
munication to me from abroad by Leopold Cassella & Co., of Frankfort-on-Main,
in the Empire of Germany Manufacturing Chemists,) do hereby declare the nature
of this invention to be as follows:-
The p. amidodiphenylamine cannot be combined with diazo bodies to form normal
azo dye-stuffs. If the two bodies are brought together no diazoamido compounds
result, but nitrogen is generated, and colorless or weakly colored substances are
formed, the constitution of which has not yet been ascertained.
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In quite a different and unforseen manner the p. amidodiphenylamine reacts on
diazo compounds, produced on the fibre from dye-stuffs which contain diazotisable
amido groups. In these cases intense and exceedingly fast dyeings are produced.
For this purpose the most useful amongst the diazotisable dye-stuffs on the one
hand, are the diazo dye-stuffs in general deriving from paradiamines, such as
benzidine and its analogous bodies, and on the other hand, amido-naphtolsulpho
acids, alpha naphtylamine, alpha naphtylaminesulpho acids a ẞ, or a B₁, a₁ B₁
amidonaphtol ether, a, ẞ, amidonaphtol-ethersulpho-acid. Of such dye-stuffs are
of special value the products from gamma amidonaphtolsulpho acid, namely diamine
black R and B, diamine blue black E, diamine black B H, diamine brown V, the
products from amido-naphtoldisulpho acid H, as diamine blue BX, 2 B, 3 B, the
naphtylene violet described in the British Patent 15346, the brown dye-stuff's
mentioned in the German Patent 58617 as well as other substitutes recommended
for the same purposes, which are brought into the market under different
denominations as diazurin, diazoblack, diazobrown, benzoblue, Nyanza black,
Tabora black, Zambesi blue, etc.
The process is explained by the following example:-100 kilos. cotton are dyed
in an alkaline bath with 5 kilos. diamine blue black E, for one hour at the boil.
It is rinsed and then entered into a cold bath, in which are dissolved 0.5 kilos.
nitrite and which is acidulated with 2 kilos. muriatic acid. After about 5 minutes
the diazotation is terminated. Then the cotton is entered after being rinsed
into a third bath, containing a solution of 15 kilos. chlorhydrate of p. amido-
diphenylamine.
At once a dark blue dyeing appears, which is fast to light and washing. In an
analogous way the other colors are developed.
Dated this 2nd day of March 1893.
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
The Production on the Fibre by the Aid of P. Amidodiphenylamine
of Dye-stuffs Fast to Light and Washing.
I, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman, (a com-
munication to me from abroad by Leopold Cassella & Co., of Frankfort-on-Main,
in the Empire of Germany, Manufacturing Chemists,) 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 :-
The p. amidodiphenylamine cannot be combined with diazo bodies to form normal
Q1

page_text: azo dye-stuffs. If the two bodies are brought together no diazoamido compounds
result, but nitrogen is generated, and colorless or weakly colored substances are
formed, the constitution of which has not yet been ascertained.
In quite a different and unforseen manner the p. amidodiphenylamine reacts on
diazo compounds produced on the fibre from dye-stuffs which contain diazotisable
amido groups. In these cases intense and exceedingly fast dyeings are produced.
For this purpose the most useful amongst the diazotisable dye-stuffs on the
one hand, are the diazo dye-stuffs in general deriving from paradiamines, such as
benzidine and its analogous bodies, and on the other hand, amidonaphtolsulpho
acids, alpha-naphtylamine, alpha naphtylaminesulpho acids a ẞ3, or a ẞ, a B₁
amidonaphtol ether, a, Bi amidonaphtolethersulphoacid. Of such dye-stuffs are of
special value the products from gamma amidonaphtol-sulpho acid, namely diamine
black R and B, diamine blue black E, diamine black B H, diamine brown V, the
products from amidonaphtoldisulpho acid H, as diamine blue B X, 2B, 3B,
the naphtylene violet described in the British Patent 15346 in the year 1890
the brown dye-stuffs mentioned in the German Patent 58617 as well as other
substitutes recommended for the same purposes, which are brought into the market
under different denominations as diazurin, diazo-black, diazo-brown, benzo-blue,
Nyanza black, Tabora black, Zambesi blue, etc.
The process is explained by the following example:-100 kilos. cotton are dyed
in an alkaline bath with 5 kilos. diamine blue black E, for one hour at the boil. It
is rinsed and then entered into a cold bath, in which are dissolved 0.5 kilos. nitrite
and which is acidulated with 2 kilos. muriatic acid. After about 5 minutes the
diazotation is terminated. Then the cotton is entered after being rinsed into a
third bath, containing a solution of 1.5 kilos. chlorhydrate of p. amidodiphenyl-
amine.
At once a dark blue dyeing appears, which is fast to light and washing. In an
analogous way the other colors are developed.
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 :-
The method of producing fast colors on the fibre by the aid of para-amidodi-
phenylamine, substantially as described.
Dated this 21st day of November 1893.
SYDNEY PITT.