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

page_text: Date of Application, 11th July 1803
Complete Specification Left, 10th Apr., 1894-Accepted, 12th May, 1894
PROVISIONAL SPECIFICATION.
Improvements relating to the Production of Colouring Matters.
ARTHUR ASHWORTH Fernhill Chemical Works Bury Manufacturing Chemist,
JOSHUA BÜRGER Fernhill Chemical Works Bury Technical Chemist do hereby
declare the nature of this invention to be as follows:-
We take alpha amido beta napthol 1:2 or its chlorhydrate, or alpha nitroso beta
napthol 2:1 or beta nitroso alpha napthol 1:2, their sulphites and sulpho acids and
condense each, in requisite proportions, with gallic acid tannic acid or other oxy-
carbonic acids, with benzoic acid or with alpha or beta napthol, or carbolic acid or
other phenols, by the help of sulphuric acid, glacial acetic acid, methylalcool or
other suitable condensing agents.
The colouring matters resulting from the above reactions give, upon mordanted
fibres, shades varying from black to brown.
Dated this 10th day of July 1893.
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, Fernhill Chemical Works Bury Technical Chemist 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 invention consists in combining nitroso naphtols, either alphahydroxy beta
nitrosonaphtalene C₁H₂OH (1) NO (2) or betahydroxyalphanitrosonaphtalene
C₁H.OH (2) NO (1) or alpha-, amidobetanaphtol with tannins or gallic acid by
means of condensing agents.
As example we proceed in the following manner
Example 1. 18.800 parts by weight of crystallised gallic acid or 17 parts by
weight of dryed gallic acid or 32.200 parts by weight of tannin are gradually mixed
with 200 parts by weight of concentrated sulphuric acid 66° B. and when dissolved
17.300 parts by weight of alpha hydroxybetanitrosona pltalene or beta hydroxy-
alphanitrosonaphtalene 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 60-70° C.
and finally kept for two hours at 85° C. to 90° C. The reaction being finished,
the mass is cooled down and poured on ice. The colouring matters precipitate in
dark flakes, which are filtered off, washed made into a paste or dryed. 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 with a
deep purplish brown colour, from which on dilution with ice water the colours are
precipitated in dark brown flakes. They are most suitably used for practical
purposes in form of a paste and they produce on chrome mordants brown shades,

page_text: which when dyed very dark, appear almost black and are of great fastness to light
and soap.
Example II. 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 66° B., and when 5
dissolved 15.9 parts by weight of alpha-amido betanaphtol or 19-600 parts by weight
of its chlorhydrate are gradually added to the solution, the mass being continuously
stirred. After all is dissolved, the temperature is raised to from 60 to 70° C.,
the mass kept at that temperature during an hour, then raised in another hour up
to from 85 to 90° C. and kept at that temperature, during two further hours,
whilst the mass is continuously stirred. After the reaction is finished the mass is
cooled down and then poured on ice. The colouring matter precipitates in a
yellowish brown paste, which is filtered off, washed and made up into a paste
or dried. The colouring matter when dry forms a brownish powder, little
soluble in cold water, easier soluble in hot water, slightly soluble in cold alcohol
more soluble in hot alcohol, very little soluble in ether, soluble in caustic soda, with
violet colour changing to brown by agitation and admixture of air, soluble in
concentrated sulphuric acid with a crimson red colour, which on dilution with
ice water precipitates the colour as brownish flakes.
The colours are most suitably used for practical purposes in form of a paste
and they produce on chrome mordanted fibres brown shades of great fastness to
light and soap.
What we claim as new is
1. The method of combining alphahydroxy betanitrosonaphtalene C₁, H₂OH (1)..
NO (2) or betahydroxyalphanitrosonaphtalene C₁H₂OH (2) NO (1) or alpha-
amide-betanaphtol, with tannius or gallic acid by means of condensing agents
substantially as described.
O
The waduata es ahtained encording to Claim No 1 which are colouring
ARTHUR ASHWORTH.
JOSHUA BÜRGER.