Improvements in the Manufacture of Azo Colours.
Year: 1891

page_text: Date of Application, 4th July, 1891
Complete Specification Left, 2nd May, 1892-Accepted. 11th June. 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Azo Colours.
We READ HOLLIDAY & SONS LIMITED of Upperhead Row, Huddersfield, in
the County of York Manufacturing Chemists and ALFRED GEORGE BROOKES of
55 & 56 Chancery Lane in the County of Middlesex, Patent Agent (a communi-
cation from abroad by Thomas Holliday of the same place Managing Director of
the said Company but at present temporarily residing at No. 7 Platt Street in the
City, County, and State of New York in the United States of America,) lo hereby
declare the nature of this invention to be as follows :-
We have found that a new class of intermediate bodies can be obtained by
combining one molecule of a tetrazo compound with one molecule of benzene-azo-
a-napthylamine or its homologues such as ortho-toluene-azo-a-napthylamine and
such like, or of the mono and disulpho acids of the same and that these new
intermediate bodies can be converted into new colouring matters by reacting on
them with another molecule of a phenol or amine or their carbo or sulpho acids.
By tetrazo compound we mean to include
tetrazo diphenyl and its homologues
tetrazo napthalene
tetrazo stilbene
tetrazo flourene
tetrazo azobenzole and homologues
tetrazo oxidiphenyl
as well as the alkylised compounds or the carbo or sulpho acids of the same.
As an example, we may take say 34.9 lbs. of the sodium salt of the monosulpho
acid of benzene-azo-a-napthylamine dissolved in 200 gallons of water to which
solution is added 100 gallous of a water paste containing 39-2 lbs. of the tetrazo
compound diamido stilbene disulpho acid-after the mixture has been stirred for
about 6 hours, a solution of 14.5 lbs. of alpha-napthylamine and 145 lbs. of muriatic
acid 22° Beaumé in 100 gallons of water is added, then the stirring being continued
a solution of 20 lbs. of carbonate of soda in 20 gallons of water is allowed to drop
into the mixture during 6 hours and after another 12 hours the stirring can be
stopped and the dye stuff thus produced is then precipitated with common salt,
filtered off and dried-it dyes unmordanted cotton a dark blue in a neutral bath
containing common salt..
These new colouring matters can be treated with nitrous acid and tetrazo
compounds are formed which are changed to new dark shaded colouring matters by
combining them with an amine or a phenol or their carbo or sulpho-acids.
These new colouring matters being more or less soluble in water our process can
be carried out in the following manner :-
The cotton or other fibre dyed with the dye stuff belonging to the above class is
passed through a weak solution of nitrous acid (which preferably is afterwards
washed off) and then impregnated with a solution of an amine or a phenol or a
sulpho or carbo acid of an amine.or a phenol.
Dated the 4th day of July 1891
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Azo Colours.
We READ HOLLIDAY & SONS LIMITED of Upperhead Row, Huddersfield, in
the County of York, Manufacturing Chemists, and ALFRED GEORGE BROOKES
of 55 & 56 Chancery Lane in the County of Middlesex, Patent Agent (a com-
munication from abroad by Thomas Holliday of the same place, Managing Director
of the said Company but at present temporarily residing at No. 7 Platt Street in
the City, County and State of New York in the United States of America) 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 :-
We have found that a new class of intermediate bodies can be obtained by
combining one molecule of a tetrazo compound with one molecule of benzene-azo-
a-napthylamine or its homologues such as orthotoluene-azo-a-napthylamine and
such like, or of the mono and disulpho acids of the same and that these new
intermediate bodies can be converted into new colouring matters by reacting on
them with another molecule of a phenol or amine or their carbo or sulpho acids.
By tetrazo compound we mean to include
tetrazo diphenyl and its homologues
tetrazo napthalene
tetrazo stilbene
tetrazo flourene
tetrazo azobenzole and homologues
tetrazo oxidiphenyl
as well as the alkylised compounds or the carbo or sulpho acids of the same.
As an example, we may take say-34.9 lbs. of the sodium salt of the monosulpho
acid of benzene-azo-a-napthylamine dissolved in 200 gallons of water to which
solution is added 100 gallons of a water paste containing 39.2 lbs. of the tetrazo
compound diamido stilbene disulpho acid after the mixture has been stirred for
about 6 hours, a solution of 14.5 lbs. of alpha-napthylamine and 14.5 lbs. of muriatic
acid 22° Beaumé in 100 gallons of water is added, then the stirring being continued
a solution of 20 lbs. of carbonate of soda in 20 gallons of water is allowed to drop
into the mixture during 6 hours and after another 12 hours the stirring can be
stopped and the dye stuff thus produced is then precipitated with common salt,
filtered off and dried-it dyes unmordanted cotton a dark blue in a neutral bath
containing common salt.
These new colouring matters can be treated with nitrous acid and compounds are
formed which are changed to new dark shaded colouring matters by combining them
with an amine or a phenol or their carbo or sulpho acids.
These new colouring matters being more or less soluble in water, our process can
be carried out in the following manner :-The cotton or other fibre dyed with the
dye stuff belonging to the above class is passed through a weak solution of nitrous
acid (which preferably is afterwards washed off) and then impregnated with a
solution of an amine or a phenol or a sulpho or carbo acid of an amine or a phenol
thereby forming the new dark shaded colouring matters on the fibre.
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 manufacture of new azo colours by combining one molecule of a tetrazo
compound with one molecule of benzene-azo-alpha-napthylamine or its homologues

page_text: or sulpho acids of the same and another molecule of a phenol or amine or their
carbo or sulpho acids substantially as described.
2. As a new manufacture the azo colours produced as herein described.
Dated
1
1000
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicants.