Improvements relating to the Production of Colouring Matters.
Year: 1893

page_text: Date of Application. 13th June, 1893
Complete Specification Left, 10th Mar., 1894-Accepted, 14th Apr., 1894
PROVISIONAL SPECIFICATION.
Improvements relating to the Production of Colouring Matters.
ARTHUR ASHWORTH Fernhill Chemical Works Bury Manufacturing Chemist
JOSHUA BÜRGER Technical Chemist Fernhill Chemical Works Bury do hereby
declare the nature of this invention to be as follows:-
We have obtained, by treating nitroso-beta napthol with ammonium sulphite or
other sulphites, a product which crystallises in colourless needles, which is easily
soluble in cold water and also dissolves in ammonia with a yellow colour which
darkens with agitation.
This product produces-if condensed with oxyacids or phenols, by the help of
such or similar condensing agents as glacial acetic acid, methyl alcohol, sulphuric
acid-valuable colouring matters.
"
Combined with diazotised bases it produces azo colouring matters.
ARTHUR ASHWORTH.
JOSHUA BÜRGER.
COMPLETE SPECIFICATION:
Improvements relating to the Production of Colouring Matters.
ARTHUR ASHWORTH Fernhill Chemical Works Bury Manufacturing Chemist
and JOSHUA BÜRGER Technical Chemist Fernhill Chemical Works Bury, 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 :-
.
It has been known for sometime that by the energetic action of sulphurous acid
an amidonaphtolsulfonic acid was produced.
We have discovered however, that by the moderate action of bisulphites another
product is obtained which is of great technical value. To obtain this product we
proceed in the following manner.
When
One part by weight of nitroso ẞ naphtol, most suitably in a finely divided paste,
is mixed with two parts by weight of bisulphite of soda solution of about 60° T.
and the mixture is gently heated on the water bath to about 25 to 30° C.
the reaction sets in, the heating is discontinued. Nitroso naphtol dissolves in
the bisulphide of soda solution and there is a rise of temperature of about 20° C.
After some time the whole mass solidifies forming a paste of greyish to white,
crystals which are our new product. The crystals are filtered, pressed and
preferably used as a paste. Instead of bisulphite of soda other bisulphites might
be used for example bisulpbite of ammonia. Caustic soda decomposes the body
and regenerates nitroso ẞ naphtol, which is precipitated in the form of its well
It is very
known sodium salt. Our new compound is easily soluble in water.
valuable for dyeing and printing purposes, producing with iron mordants beautiful
green and with chrome mordants brown shades.
:

page_text: The new product can be condensed with oxycarbonic acids such as gallic acid
and also with tannin forming valuable new brown colouring matters, dyeing with
chrome mordants. We proceed in the following way 18.800 parts by weight of
crystallised gallic acid, or 17 parts by weight of dried gallic acid or 32.200 parts
by weight of tannin, are gradually mixed with 200 parts by weight of concentrated
sulphuric acid of 170° T., and when dissolved 25.9 parts by weight of our new
product in a dry form are gradually added to the solution, the mass being
continuously stirred and care being taken, that the temperature does not rise
above 25° C.
After all is dissolved the temperature is raised to 40° C. the mass kept at that
temperature during an hour, then raised in another hour up to 60 to 80°C, and
finally kept for two hours at 85 to 90° C. The reaction being finished 'the mass is
cooled down and poured on ice.
1
The colouring matters precipitate in dark flakes, which are filtered, off, washed,
made into a paste or dried.
The colouring matters, when dry form a dark powder almost of black appearance,
difficultly soluble in cold water, more soluble in boiling water, difficultly soluble in
alcohol and very difficultly soluble in ether.
They are soluble in dilute caustic soda with a brown colour. They are. soluble
in concentrated, sulphuric acid. They are most suitably used for practical purposes
as a paste and they produce on chrome mordants brown shades which when dyed
very dark appear almost black and are of great fastness to 'light and soap.
Another important property of this new combination between nitroso ẞ naphtol
and sodiumbisulphite is the fact, that it combines with diazo compounds, producing
colouring matters dyeing and printing with mordants. For instance 14.3 parts by
weight of a naphtylamine or 14:3 parts by weight of ẞ naphtylamine are diazotised
in the usual way and combined with 25-9 parts by weight of our new product of
combination, between nitroso ẞ naphtol and sodiumbisulphite, which has been
dissolved in a solution of sodiumcarbonate.
:
The mixture is le't standing for some time and the new colours salted, out
filtered pressed and carefully dried. They form reddish brown to brown powders
and are by preference used as a paste. They are easily soluble in water, dye and
print on chrome mordants reddish brown to brown shades.
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 method of producing a new compound which consists in treating nitroso
nenhtal
2. The product obtained according to Claim No. 1. which has the following
properties. It forms greyish to white crystals, is easily soluble in water, is
decomposed on addition of caustic alkalies and. produces green shades with iron
mordants and brown shades 'with chrome mordants substantially as heretofore; set
forth.
3. The method of producing colouring matters dyeing with chrome.mordants.by
combining the product claimed in Claim No. 2 with gallic acid.tor tannin
substantially as heretofore set forth.
4. The products obtained according to Claim No. 3 which have the following
properties. They form a dark powder almost of black appearance, are difficultly
soluble in cold water, more soluble in boiling water difficultly soluble in alcohol and
very difficultly soluble in ether. They are soluble in dilute caustic soda with a

page_text: brown colour and they are soluble in concentrated sulphuric acid. They produce
on chrome mordants brown shades of great fastness to light and soap substantially
as heretofore set forth.
5. The method for and the production of colouring matters by combining diazo
compounds with the product claimed in Claim No. 2 substantially as heretofore set
forth.
6. The colouring matters prepared according to Claim No. 5 which have the
following properties. They form reddish brown to brown powders, are easily
soluble in water dye and print on chrome mordants reddish brown to brown shades
substantially as heretofore set forth.
Dated this 9th day of March 1801
ARTHUR ASHWORTH:
JOSHUA BÜRGER.