Production of Dye-stuffs from Di-azo-safranines and Amido Naphtoles.
Year: 1893

page_text: Date of Application, 22nd Dec., 1893
Complete Specification Left, 21st Sept., 1894-Accepted, 27th Oct.,
1894
PROVISIONAL SPECIFICATION.
The Production of Dye-stuffs from Di-azo-safranines and Amido
Naphtoles.
I, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman, (a com-
munication to me from abroad by Leopold Cassella & Co., of No. 19 Liebigstrasse,
Frankfort on Main, in the Empire of Germany,) do hereby declare the nature of
this invention to be as follows:-
As is known the amidonaphtoles and their sulpho acids can be transformed into
azo dye-stuffs which are distinguished by their dark shades and their great fastness.
These properties of the named class of bodies have hitherto only been utilized for
the production of sulphonated azo derivatives which dye direct cotton or wool.
My correspondents have found that also black basic dye-stuffs, that is to say dye-
stuffs which dye cotton mordanted with tannin, may be obtained from the amido-
naphtols by combining the same with diazosafranines. The method applied is for
instance the following:
19.
:
35 kilos. safranine C H₁, N. Cl are dissolved in water and after adding some
muriatic acid, diazotised with 7 kilos. nitrite of sodium. The thus formed diazo
compound is introduced into a solution of 16 kilos. 8 amidonaphtol (German
Patent 69458) in 12 kilos. muriatic acid. After a short time the formation of the
dye-stuff is terminated, and the dye-stuff to a large part precipitated, and after
complete precipitation by the aid of common salt it is filtered. It is easily soluble in
water with a bluish black color and dyes cotton mordanted with tannin an intense
blue black.
Instead of in acid solution the combination may also be made in alkaline solution,
and then acidulated and precipitated. The dye-stuff thus obtained differs only
slightly from that formed in acid solution.
If in the place of a, ẞ, amidonaphtol the a, a, or the a₁ a or the ẞ ẞ or the a₁ ß.
amidonaphtol is used, quite analogous dye-stuffs are obtained.
Dated this 22nd day of December 1893.
COMPLETE SPECIFICATION.
The Production of Dye-stuffs from Di-azo-safranines and Amido
Naphtoles.
I, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman, (a com-
munication to me from abroad by Leopold Cassella & Co. of No. 19 Liebigstrasse,
Frankfort on Main, in the Empire of Germany,) 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 :-
As is known the amidonaphtols and their sulpho acids can be transformed into
azo dye-stuffs which are distinguished by their dark shades and their great fastness.
These properties of the named class of bodies have hitherto only been utilized for
the production of sulphonated azo derivatives which dye direct cotton or wool.
My correspondents have found that also black basic dye-stuffs, that is to say dye-
stuffs which dye cotton mordanted with tannin, may be obtained from the amido-

page_text: naphtols by combining the same with diazosafranines. The method applied is for
instance the following:
35 kilos. safranine C₂, H₁, N. Cl are dissolved in water and after adding some
muriatic acid, diazotised with 7 kilos. nitrite of sodium. The thus formed diazo
compound is introduced into a solution of 16 kilos. & amidonaphtol (German
Patent 69458) in 12 kilos. muriatic acid. After a short time the formation of the
dye-stuff is terminated, and the dye-stuff to a large part precipitated, and after
complete precipitation by the aid of common salt it is filtered. It is easily soluble
in water with a bluish black color and dyes cotton mordanted with tannin an
intense blue black,
Instead of in acid solution the combination may also be made in alkaline solution,
and then acidulated and precipitated. The dye-stuff thus obtained differs only
slightly from that formed in acid solution.
a1.
If in the place of α, ẞ amidonaphtol the a₁a, or the a₁ α or the ẞ₁ ß, or the a₁ ß₂
amidonaphtol is used, quite analogous dye-stuffs are obtained.
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. Producing basic colouring matters by combining diazo-safranines and amido-
naphtols substantially as described.
2. The new colouring matters hereinbefore described.
D: 1 SA
1004