PROCESS OR PROCESSES FOR THE PRODUCTION OF SOLUBLE COMBINATIONS OF CERTAIN AZO COMPOUNDS WITH BISULPHITES, AND FOR UTILISING THE SAME IN DYEING AND PRINTING
Year: 1885

page_text: COMPLETE SPECIFICATION.
I, HERBERT JOHN HADDAN, of 67 Strand, in the City of Westminster, Civil
Engineer, do hereby declare the nature of my invention for PROCESS OR PROCESSES
FOR THE PRODUCTION OF SOLUBLE COMBINATIONS OF CERTAIN AZO COMPOUNDS
WITH BISULPHITES, AND FOR UTILISING THE SAME IN DYEING AND PRINTING,
a communication to me from abroad by Doctor Eugen Frank and the Farben-
fabriken vorm. Friedr. Bayer and Co, both of Elberfeld, Prussia, and in what
manner the same is to be performed, to be particularly described and ascertained,
in and by the following statement:—
This invention has for its object to utilise certain azonaphtol-colouring matters
derived from the amidoazobenzol or its homologues, or from benzidine.
The colouring matters, which are produced by uniting in the well known
manner:
I. Diazoazobenzol and its homologues, or
II. Benzidine and its homologues, or
III. Alpha and Beta-Diazonaphtaline with the two beta-naphtol-monosulpho-
acids, or
IV. Diazoazobenzol monosulpho-acid and its homologues with alpha and beta-
naphtol are almost insoluble, and become quite insoluble by boiling with water.
By treating these colouring matters in a fine state of division with acid sulphites
in hot aqueous or alcoholic solution, they are dissolved, and a double salt is
produced.
These double salts are soluble in water, mostly of a yellow colour and may be
split into their component parts by treating them, especially with alkalies.
This quality renders these bisulphite compounds applicable for printing and
dyeing, textile fibres, and especially those of vegetable origin.
The cotton or other textile fibre to be printed or dyed, is impregnated with the
said compounds, and the colour is produced by steaming or boiling.

page_text: For instance: muriate of amidoazotolnol is diazotized in the well-known way
and combined with the monosulpho-acid of the betanaphtol described by Schäffer.
The colouring matter produced is precipitated with salt, and the moist paste
remaining in the filter press is digested with the threefold weight of alcohol (of
90%) and the same weight of a 25% solution of natrium bisulphite, with the
addition of some acetic acid, (on a water bath), until the colouring matter has
been dissolved. The solution is then diluted with double the volume of water,
filtered, and precipitated with salt.
The precipitate formed is directly applicable for dyeing and printing by the
method indicated.
Having now particularly described and ascertained the nature of my said
invention and in what manner the saine is to be performed, I declare that what
I claim is
1. The conversion of the colouring matters produced in the well known manner
by the combination of:
a, diazoazobenzol and its homologues with the two beta-naphtol-monosulpho-
acids
b, the tetrazodiphenyl and its homologues with the two beta-naphtol-mono-
sulpho-acids
c, the alpha and beta-diazonaphtalino with the two beta-naphtol-monosulpho
acids
d, the diazoazobenzol-monosulpho-acid and its homologues with alpha and beta-
naphtol
into bisulphite compounds soluble in water.
2. The application of the bisulphite compounds mentioned in the preceding
claim, for dyeing and printing, by impregnating with the said compounds the
fibrous material to be thus treated, and producing the required colour by steaming
or boiling.