Year: 1895

page_text: Date of Application, 16th Apr., 1895
Complete Specification Left, 16th Jan., 1896-Accepted, 22nd Feb., 1896

page_text: in a suitable manner with alkylating agents, in order to displace one or several
hydrogen atoms of the amido groups by alkyl radicles of the fatty or aromatic
series.
In carrying out the new process hereinbefore defined, my foreign correspondents
do not limit themselves to the particulars given in the above example, as the
directions contained therein can be varied. Thus, for instance, other suitable
solvents or diluents can be used in place of alcohol, or the process may be carried
out without the addition of solvents. Such or similar modifications do not alter
the nature of this invention, which is general relates to a new process for producing
dye-stuffs, which process consists in treating with alkylating agents safranine dye-
stuffs derived from ortho toluidine.
NEWTON & SON,
Agents for the Applicant.
The Manufacture of Colouring Matters.
I HENRY EDWARD NEWTON of The Office for Patents, 6 Bream's Buildings,
Chancery Lane, in the County of London, Patent Agent, 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 :-
My foreign correspondents discovered some time since that new safranine
colouring-matters can be produced by conjointly oxidising a molecular proportion
of monalkyl-ortho-toluidine, a molecular proportion of a para-diamido-compound
containing at least one free amido group, and a molecular proportion of a primary
aromatic monamido compound.
My foreign correspondents have now found, that the same dye stuffs are obtained
by the action of alkylating agents on the safranine dye-stuffs derived from ortho-
toluidine.
The process is illustrated by the following typical example. The parts are by
weight.
EXAMPLE.
COLOURING-MATTER OBTAINED BY ETHYLATING TOLUSAFRANINE.
36 parts (or one molecular proportion) of the "tolusafranine" (formed by the
conjoint oxidation of a molecular proportion of paramido-ortho-toluidine and two
molecular proportions of ortho-toluidine) are mixed with 100 parts of alcohol and
22 parts (or two molecular proportions) of ethyl bromide. The liquid is heated
during about 10 hours at about 180 degrees Centigrade. After distilling off the
alcohol, the residue is dissolved in water and the alkylated tolusafranine is
precipitated from the solution by the addition of common salt. The finished
colouring-matter is then filtered off, pressed, and purified in a suitable manner.
On cotton prepared with tannic acid or the like, it produces shades corresponding
with those of the dye-stuff previously prepared by my foreign correspondents, by
conjointly oxidizing a molecular proportion of paramidomouethyl-ortho-toluidine,
a molecular proportion of monethyl-ortho-toluidine, and a molecular proportion of
'ortho-toluidine.
An analogous colouring-matter is produced on using only one, in place of the two
molecular proportions of ethylbromide prescribed in the above example. The
monethylated tolusafranine thus obtained is similar to the dye-stuff obtained by
conjoint oxidation of one molecular proportion of paramidomonethyl-ortho-toluidine
and two of orthotoluidine.
An analogous effect is produced if, instead of the ethyl bromide prescribed in

page_text: the example, other alkylating agents are used, such as ethyl-chloride, methyl-
chloride, or methyl-bromide, or other alkylhaloids of the fatty series, including
benzylhaloids, or if similar or analogous safranine dye-stuffs, for example, the
colouring matters obtainable by subjecting to conjoint oxidation, either a molecular
proportion of paraphenylene diamine and two molecular proportions of ortho-
toluidine, or a molecular proportion of paratoluylene diamine and two molecular
proportions of aniline or the like, are substituted for the tolusafranine used in the
said example, that is to say, if these dye-stuffs are treated in a suitable manner
with alkylating agents, in order to displace one or several hydrogen atoms of the
amido groups by alkylradicles.
In carrying out the new process hereinbefore defined, my foreign correspondents
do not limit themselves to the particulars given in the above example, as the
directions contained therein can be varied. Thus, for instance, other suitable
solvents or diluents can be used in place of alcohol, or the process may be carried
out without adding solvents. Such or similar modifications do not alter the nature
of this invention, which, in general terms, relates to a new process for producing
dye-stuffs, which process, consists in alkylating safranine dye-stuffs derived from
orthotoluidine.
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
from abroad, I declare that what I claim is :-
The process for producing safranine colouring matters, which process consists in
treating with methylating, ethylating, benzylating, or the like alkylating agents,
the safranine dye-stuffs containing one, or two, or three, orthotoluidine radicles.
Dated this 14th day of January 1896.
NEWTON & SON,
Agents for the Applicant.