Improvements in the Production of Azo-colouring Matters.
Year: 1890

page_text: Date of Application, 3rd Jan., 1890
Complete Specification Left, 2nd Oct., 1890-Accepted, 8th Nov., 1890
PROVISIONAL SPECIFICATION.
Improvements in the Production of Azo-colouring Matters.
We, RICHARD JOHN FRISWELL, a Director of Brooke Simpson and Spiller Limited,
of Atlas Works, Hackney Wick, in the County of Middlesex, Aniline Dye Manu-
facturers, and ARTHUR GEORGE GREEN, a Chemist to the same firm do hereby declare
the nature of this invention to be as follows:-
This invention relates to the production of dye stuffs from oxy-azo-toluidine,
m. p. 212° C. (Limpricht, Berichte vol. 18, page 1405), by acting on it with nitrous
acid, or with a salt of nitrous acid and an acid, and combining the diazo compound so
formed with amines and phenols and their sulphonic and carboxylic acids.
The following example will show the method employed:-25-6 kilos., of oxy-azo-
toluidine m. p. 212° C. (Limpricht), or an equivalent quantity of the sulphate or other
salt, is suspended or dissolved in water containing a free mineral acid and diazotised
by the addition of 14 kilos., of sodium nitrite. The solution of the diazo compound
thus obtained is poured into an aqueous solution of 49-2 kilos., of the sodium salt
of (1-4) naphthol sulphonic acid (corresponding to naphthionic acid) and kept
alkaline until the formation of the dye stuff is complete. The colouring matter is
then filtered off, and dyes unmordanted cotton a red colour from a neutral or alkaline
bath.
Doted this 2nd day of Januar 1800
AMBROSE MYALL,
21, Cockspur Street, London, S.W., Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Production of Azo-colouring Matters.
We, RICHARD JOHN FRISWELL, a Director of Brooke Simpson & Spiller Limited, of
Atlas Works, Hackney Wick, in the County of Middlesex, Aniline Dye Manu-
facturers, and ARTHUR GEORGE GREEN a Chemist to the same firm 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 object of our invention is to effect the preparation of azo-coloring matters from
oxyazotoluidine, of melting point about 212° Centigrade (see Limpricht Berichte
vol. 18, page 1405) by acting on it with nitrous acid, or with a salt of nitrous acid
and an acid, and combining the diazo compound, so formed, with amines or phenols,
or their sulphonic or carboxylic acids.
The following is an example of the practical operation of our process. 25.6 kilos.
of oxyazotoluidine, of melting point 212° Centigrade (Limpricht), or an equivalent
quantity of the sulphate or other suitable salt, is suspended or dissolved in water
containing a free mineral acid and diazotised by the addition of 14 kilos. of sodium
nitrite (98% Na NO₂).
The solution of the diazo compound thus obtained is poured into an aqueous
solution of 49-2 kilos. of the sodium salt of (1-4) alpha naphthol sulphonic acid
(corresponding to naphthionic acid) and kept alkaline until the formation of the
dyestuff is complete. The coloring matter is then filtered off and dried.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The preparation of azo-coloring matters by the diazotisation of oxyazotoluidine

page_text: and the combination of the diazo compound with amines, phenols, or their sulphonic,
or carboxylic acids, substantially as herein set forth.
2. As new articles of manufacture, the azo-coloring matters, prepared in the
manner substantially as herein set forth.
Dated this 3rd day of October 1890.
AMBROSE MYALL,
21, Cockspur Street, S.W., Agent for the Applicants.