Improvements in the Manufacture of Colouring Matters.
Year: 1891

page_text: Date of Application, 16th Feb., 1891
Complete Specification Left, 11th Nov., 1891-Accepted, 19th Dec., 1891.
PROVISIONAL SPECIFICATION.
[Communicated from abroad by Messrs. WIRTH & Co., of Frankfort-on-the-
Main, in the Empire of Germany, acting as Agents of A. Leonhardt & Co.,
of Muhlheim, near Frankfort-on-the-Main, in the Empire of Germany,
Manufacturers.]
Improvements in the Manufacture of Colouring Matters.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co. Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, do hereby
declare the nature of this invention to be as follows:-
In the Specification of Letters Patent No. 399487 it is stated that, certain
colouring matter combinations of tetrazo-sulpho-compounds with phenols have the
defect, that the fibre dyed therewith shows a change of colour into red when
treated with alkalies. When such colouring matters are subjected to an alkylation,
this defect is removed.
The communicators have found that the same thing occurs concerning the dye-
stuff formed by the action of tetrazo-naphthalene disulpho-acid on phenol or cresol.
When this dye-stuff is alkylized according to well known methods, a new colouring
matter is produced which is sufficiently fast against alkalies.
Dated this 16th day of February 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Colouring Matters.
I, HENRY HARRIS LAKE of the firm of Haseltine Lake & Co. Patent
Agents 45 Southampton Buildings in the County of Middlesex 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 :-
In the Specification of British Letters Patent No. 399487 it is stated that certain
colouring matter combinations of tetrazosulpho compounds with phenol have the
defect that the colour obtained therewith changes into red when treated with
alkalies. It was also stated that this property of the said colouring matters is
based upon their capability of forming basic salts. When such colouring matters
are deprived of their capability of forming basic salts, that is to say when they are
subjected to an alkylation, new colouring matters are produced which are sufficiently
fast for dyeing purposes.
The communicators have found that the same is the case with the dyestuff formed
by the action of tetrazonaphthalene disulphoacid (which can be obtained by nitrating
betanaphthalenedisulphoacid, reducing the dinitro compound and diazotising the
diamido compound thus formed) on phenol, which product was not known at the
time of filing the said Specification No. 39947.
The alkylation of this dyestuff is effected by known methods. The following
examples will show in what manner this invention may be carried into practice.
1st. 10 kilos. of the phenol dyestuff are boiled with 7 kilos. of benzylchloride,
7 litres of sodalye of 30% and 70 litres of water for several hours until the trans-
formation into the new colouring matter is effected and the benzylchloride has
nearly disappeared. The whole mass is then extracted with hot water, the
remaining benzylchloride is boiled off and the dyestuff is precipitated from the
Price dl

page_text: filtered liquid by means of common salt and freed from any unaltered phenol
dyestuff by hot dilute alkaline salt water (in which the benzylated dyestuff is
not soluble).
2nd. 6 kilos. of the phenol dyestuff are heated together with 30 litres of water,
2.5 kilos. of sodalye of 30% and 6 kilos. of ethylbromide, in an autoclave for about
eight hours up to 70 to 100 degrees Centigrade the mass being agitated during the
whole time. After cooling and opening the autoclave the ethylated colouring
matter is filtered and separated from any unchanged phenol colouring matter by
washing with hot alkaline dilute salt water (in which only the phenol dyestuff
is soluble).
By methylating the said dyestuff instead of ethylating a similar colouring matter
is produced.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed as communicated to me by
my foreign correspondents, I declare that what I claim is.
First. The process of converting the colouring matter derived from tetrazo-
naphthalenedisulphoacid and phenol, which possesses the property of forming &
basic salt of another tint, into fast colouring matters which do not show this
property, this process consisting in an alkylation substantially as hereinbefore
described.
Second. The alkylated colouring matters produced substantially as hereinbefore
desore
Dexer 20
pated this 11th day of November 1891.
HASELTINE, LAKE & Co.,
Dated this 11th day of November 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.