Improvements in the Dyeing of Hair and Furs.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Dyeing of Hair and Furs.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, in the County of London, Consulting Engineer and Chartered Patent Agent,
do hereby declare the nature of this invention (as communicated to me by The
Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the Empire of Germany,
Chemical Manufacturers,) to be as follows: -
In the Specifications of German Letters Patent Nos. 47349, 51073 and 80814
are described means of producing brown, gray or black shades on hair or furs by
first impregnating them with solutions of certain aromatic amido-, diamido- or
amidooxy-derivatives and then treating them with oxidizing agents.
The bisubstituted benzene-derivatives, such as p-phenylenediamine, dimethyl-
para-phenylenediamine, para-amidophenol, methyl-para-amidophenol and the like,
which have hitherto been used for dyeing hair according to the processes described
in the specifications above referred to, contain their active groups in para-position
to one another and it may therefore be concluded, that such constitution, allowing
the formation of quinonoid oxidation products, was considered essential for the
production of the colours in question on hair or furs.
My foreign correspondents have now discovered that animal hair can likewise
be dyed by using ortho-amidophenol and certain of its substitution products
instead of the above mentioned para-derivatives. The colours obtained by means
of these ortho-derivatives are distinguished by their yellow tint, which cannot
be obtained by using the para-derivatives above mentioned.
Ortho-amidophenol and its substitution products can also be applied with
advantage in admixture with other easily oxidisable substances, such as pyrogallic
acid, para-amidophenol, para-phenylenediamine and the like; these mixtures
likewise produce on hair or furs the yellower tints which are frequently preferred
to the brown shades obtainable by means of the materials heretofore used.
Results of practical value have been obtained by using the following
derivatives: ortho-amidophenol, 4-chlor-ortho-amidophenol, 4-6-dichlor-ortho-
amidophenol, 4-nitro-ortho-amido-phenol, 46 dinitro-ortho-amidophenol, 4-chlor-
6-nitro-orthoamidophenol..
The following typical example will serve to further illustrate this new process.
The furs are first treated with an aqueous solution of potassium bichromate
(2 gr. per litre) and cream of tartar (1 gr. per litre). After lying in this
solution for 12 hours the furs are removed, rinsed, hydro-extracted and then
introduced into a solution containing to 2 gr. of ortho-amido-phenol according
to the shade desired. To the latter solution may preferably be added
small quantities of peroxide of hydrogen solution and of ammonia. In this

page_text: bath the goods are allowed to lie for several hours whereupon they are well
rinsed and then finished in the usual manner.
Dated this 26th day of November 1898.
ABEL & IMRAY,
Agents for the Applicant.
Improvements in the Dyeing of Hair and Furs.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, in the County of London, Consulting Engineer and Chartered Patent Agent,
do hereby declare the nature of this invention (as communicated to me from
abroad by The Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the
Empire of Germany, Chemical Manufacturers,) and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement:—
In the Specifications of German Letters Patent Nos. 47349, 51073 and 80814
are described means of producing brown, gray or black shades on hair or furs by
first impregnating them with solutions of certain aromatic amido-, diamido- or
amidooxy-derivatives and then treating them with oxidizing agents.
The bisubstituted benzene- derivatives, such as para-phenylenediamine,
dimethyl-para-phenylenediamine, para-amidophenol, methyl-para-amidophenol
and the like, which have hitherto been used for dyeing hair according to the
processes described in the specifications above referred to, contain their active
groups in para-position to one another and it may therefore, be concluded, that
such constitution, allowing the formation of quinonoid oxidation products, was
considered essential for the production of the colours in question on hair or
furs.
My foreign correspondents have now discovered that animal hair can likewise
be dyed by using ortho-amidophenol and certain of its substitution products
instead of the above mentioned para-derivatives. The colours obtained by means
of these ortho-derivatives are distinguished by their yellow tint, which cannot
be obtained by using the para-derivatives above mentioned.
Ortho-amidophenol and its substitution products can also be applied with
advantage in admixture with other easily oxidisable substances, such as pyrogallic
acid, para-amidophenol, para-phenylenediamine and the like; these mixtures
likewise produce on hair or furs the yellower tints which are frequently preferred
to the brown shades obtainable by means of the materials heretofore used.
Results of practical value have been obtained by using the following
derivatives: ortho-amidophenol, 4-chloro-ortho-amidophenol, 4: 6-dichloro-ortho
amidophenol, 4-nitro-ortho-amidophenol, 4: 6-dinitro-ortho-amidophenol, 4-chloro-
G-nitro-orthoamidophenol..
The following typical example will serve to further illustrate this new process.
The furs are first treated with an aqueous solution of potassium bichromate
(2 grams per litre) and cream of tartar (1 gram per litre). After lying in this solu-
tion for 12 hours the furs are removed, rinsed, hydro-extracted and then introduced
into an aqueous solution containing to 2 grams per litre of ortho-amido-phenol
according to the shade desired. To the latter solution may preferably be added
small quantities of peroxide of hydrogen solution and of ammonia.
bath the goods are allowed to lie for several hours whereupon they are well
In this
rinsed and then finished in the usual manner.

page_text: Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, I declare that what I claim
is:-
-
The herein described process for dyeing hair and furs by treating the same
with solutions of ortho-amidophenol or its chloro- or nitro-derivatives or mixtures
of these compounds with other easily oxidisable substances such as pyrogallic
acid, para-amidophenol, para-phenylenediamine and with oxidising agents.
Dated this 22nd day of July 1899.
ABEL & IMRAY,
Agents for the Applicant.