Improvements in the Manufacture and Production of Colouring Matters for Dyeing and Printing.
Year: 1889

page_text: Date of Application, 25th Nov., 1889-Accepted, 4th Jan., 1890
COMPLETE SPECIFICATION.
Improvements in the Manufacture and Production of Colouring
Matters for Dyeing and Printing.
I CHARLES DREYFUS Director of the Clayton Aniline Company Limited of Clayton
near Manchester in the County of Lancaster 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:-
Diazotised Primuline combined on the fibre with Beta Naphthol gives a colouring
matter which has been used with advantage for dyeing cotton goods.
Primuline consists chiefly of two sulphonic acids riz.-Dehydro-thio-paratoluidine
sulphonic acid and the sulphonic acid of the so called pure primuline base (see
Jacobson; Berl. Ber. 1889; 330, Gettermann; Berl. Ber. 1889; 422 and Green ;
Journal Chem. Soc. May 1889) hence the combination of diazotised Primuline with
beta naphthol contains two products. These products differ very much in shade and
are of different values the dehydro-thio-para-toluidine-sulphonic acid giving a colouring
matter dyeing or printing a bright red which is very valuable whereas the sulphonic
acid of the so called pure primuline base gives a less valuable dull blueish-red.
The fixed alkaline salts of these colouring matters are not very soluble in water but
the ammonia salt is more soluble than the salts of the fixed alkalies. I employ there-
fore by preference the ammonia salt which can be used for dyeing animal fibres and
for printing wool and cotton goods.
I give the following as an example of how my invention can be carried out, in
practice according to the best method with which I am acquainted but I do not limit
myself to the precise details.
I dissolve 100 parts (by weight) of sodium salt of dehydro-thio-paratoluidine-
sulphonic-acid and 21 parts of nitrite of soda in 3000 parts of water and I pour
this solution slowly into an agitated solution of 120 parts of hydrochloric acid of a
specific gravity of 1.17 and 500 parts of water. The diazo compound thus formed is
then poured into a solution of 42 parts of beta naphthol in 125 parts of caustic soda of
a specific gravity of 134 and diluted with 500 parts of water. The combination
after some hours agitation is completed. If I wish to obtain the soda salt of the
coloring matter I filter press and dry the substance but for manufacturing the
ammonia salt I add 90 parts of hydrochloric acid (1.17 specific gravity) which
precipitates the insoluble sulpho acid. The precipitate is filtered washed and pressed.
The pressed colour acid is dissolved in liquid ammonia which may be done as
follows:-
For 100 parts (by weight) of the pressed paste (containing 12 per cent. of dry
substance) I use 5 parts of liquid ammonia (of a specific gravity of 0.9 to 0.95) and
I thoroughly mix the ammonia with the paste and then I dry it.
The ammonia salt can also be obtained by double decomposition of salts of the
colour acid with suitable ammonia salts such for example as the calcium salt of the
colour acid and the carbonate of ammonia.
The coloring matter thus obtained dyes wool in an acid bath in shades which are
fast to fulling and dies also wool which has been previously mordanted in bichromate
and sulphuric acid and can therefore be used with dye woods. It can also be used
for printing corton goods being applied to the goods with basic sulphate of alumina,
and then steamed by which process the colour is fixed to the fibre.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The manufacture of coloring matter by combining diazotised dehydro-thio-
para-toluidine-sulphonic-acid with beta-naphthol.

page_text: 2. The manufacture of coloring matter by combining diazotised dehydro-thio-para-
toluidine-sulphonic-acid with beta naphthol and then converting the combination into
an ammonia salt.
3. As new articles of manufacture the coloring matters produced in the manners
hereinbefore described and claimed.
Dated this 25th day of November 1889.
J. H. JOHNSON & Co.,
Agents.