A NEW OR IMPROVED "communicated MANUFACTURE OF YELLOW AND ORANGE COLOURING MATTERS
Year: 1883

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LETTERS PATENT to John Imray of N° 28. Southampton Buildings Chancery
Lane in the County of Middlesex, for an Invention of "A NEW OR IMPROVED
"communicated
MANUFACTURE OF YELLOW AND ORANGE COLOURING MATTERS
to him from abroad by La Societé Anonyme des Matières colorantes et.
Produits Chimiques of St Denis and Mess L. Roussin and A. Rosenstiehl
both of Paris and all in the French Republic
PROVISIONAL SPECIFICATION left by the said John Imray at the Office
of the Commissioners of Patents on the 28th September 1883.
"
"
JOHN IMRAY of N° 28 Southampton Buildings Chancery Lane in the County
of Middlesex A. NEW OR IMPROVED MANUFACTURE OF YELLOW AND ORANGE
COLOURING MATTERS' [communicated to him from abroad by La Societé Anonyme
des Matières colorautes et Produits Chimiques of St Denis and Mess" L. Roussin
and A. Rosenstiehl both of Paris and all in the French Republic]
Most of the nitrogenous colouring matters owe their solubility in water to the
presence of the radical of sulphuric acid. The communicants of this invention
have found that by substituting for the group SO³ H the radical of carbonic acid,
that is to say CO H, some of these colouring matters are sufficiently soluble in
water to be available for use. This invention relates to the manufacture of colouring
matters of the kind referred to, of which the following is an example.
20 Kilogrammes of paramidobenzoate of soda dissolved in 500 Litres of water
are mixed cold with a solution containing SG Kilogr. of pure nitrite of soda and
19 Kilogr. of sulphuric acid at 66° Beaumé. Paradiazobenzoic acid is formed,
which has added to it an aqueous solution of 13 Kilogr. Resorcine and is saturated
with a suitable base, soda or ammonia. In this neutral or slightly alkaline
medium the colouring matter is produced in solution in water; it is separated by
acidifying, and is thus obtained in an acid condition insoluble in water. It is
collected, washed, squeezed and saturated with ammonia or carbonate of soda.
By this process matters which dye textile fibres yellow are obtained by the
action of the diazometabenzoic, the diazoparabenzoic, the diazoorthocinnamic, the

page_text: diazoparacinnamic or the diazophtolic acids on phenol, resorcine, diphenylamine,
methyl, ethyldiphenylamine, dimethylaniline, diethylaniline or dibenzylaniline;
and matters which dye orange by the action of any of the acids named above on
naphthol a, naphthol ẞ or naphthylamine a. And generally by substituting the
amidic carboxylic acids such as amidobenzoic acid for the corresponding sulphonic
acids in the production of nitrogenous colouring matters in the state of free acid,
matters are produced insoluble in water, but their alkaline salts are sufficiently
soluble.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Imray in the Patent Office on the 20th March 1884.
"
JOHN IMRAY of N° 28 Southampton Buildings, Chancery Lane in the county
of Middlesex "A NEW OR IMPROVED MANUFACTURE OF YELLOW AND ORANGE
COLOURING MATTERS A communication to me from abroad by "La Societé
Anonyme des Matières colorantes et Produits Chimiques of St Denis, and
Mess L. Roussin and A. Rosenstiehl both of Paris, and all in the French
Republic.
This invention relates to the manufacture of coloring matters by the action of
parabenzoic or metabenzoic acids on secondary amines, such as diphenylamine or
monobenzylaniline. The following is an example of the process.
5 Kilogrammes of paramidobenzoate or metamidobenzoate of soda are dissolved
in 200 litres of water, to which is added a solution of 6-6 Kilogramines of Nitrite
of soda at a strength of 33 per cent. The mixture is acidified by addition of
9.4 Kilogrammes of Sulphuric acid diluted to 53° Beaumé, the temperature being
kept below 20° Cent. by addition of ice. The mixture is poured on 5-3 Kilogrammes
of diphenylamine or monobenzylaniline finely divided and suspended in 170 Litres
of Water acidulated by sulphuric acid. After 5 to 8 days, the reaction is complete,
producing a colouring matter insoluble in water, which, being filtered, washed and
drained, is ready for use. It may be obtained in the form of a salt of soda or
ammonia. In employing the coloring matter for dyeing, the best mordants aro
salts of chromiuin, such as the acetate, or salts of aluminium.
"
Having thus described the nature of this invention and in what manner the
same is to be performed, as communicated to me by my foreign correspondents,
I claim-
The herein described process for the manufacture of coloring matters.
In Witness whereof, I the said John Imray have hereunto set my hand and
seal this Nineteenth day of March, in the year of our Lord, one thousand, eight
hundred and eighty-four.
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