An Improved Process for Mordanting Cotton for Aniline Black.
Year: 1897

page_text: Date of Application, 13th Nov., 1897
Complete Specification Left, 12th Aug., 1898-Accepted, 22nd Oct.. 1898
PROVISIONAL SPECIFICATION.
An Improved Process for Mordanting Cotton for Aniline Black.
We, ADOLPHE CLEMENT MAROT, Dyer, and ANTOINE BONNET, Chemist, both of
Troyes, in the Republic of France, do hereby declare the nature of this inveu-
tion to be as follows:-
-
Mordanting of cotton for dyeing with aniline black with oxydation has been
done as well for cotton in hanks as for the cotton in the loose or in piece, after
the fibre has been boiled for a convenient time.
For cotton in hanks the boiling is also most frequently followed by rincing
and even drying before passing it into the appropriate mordant.
We avoid this preliminary work of preparation of the cotton, by modifying
the composition of the mordants used, not in their amount in active materials
such as aniline salt and oxydizing products, but we modify their amount in water.
We replace a certain quantity of water used with the mordant by a correspond-
ing quantity of alcohol, and we obtain, in the mordanting bath, a perfect im-
pregnation of the unboiled cotton.
We use preferably methylic alcohol of 90 degrees strength on account of its
low price, and use about a fifth of the total quantity of the liquid, but this pro-
portion is not absolute and we may either increase it or diminish it according to
desire and especially when the special composition of the mordant allows of
heating during the operation of mordanting."
Independently from the economy of work and steam, which our process of mor-
danting effects we must mention the following advantages of the use of the
alcoholized mordants.
1. The unboiled fibre gives on the dynamometer a resistance always superior
to that of boiled cotton, the surplus of resistance attains and surpasses some
times 6% and we preserve it by mordanting directly unboiled cotton.
2. The fineness of the fibre, its silky qualities, its softness, and especially its
regularity are better preserved by the suppression of the boiling, than by mor-
danting on boiled fibre.
3. The oxydizing of the cotton in chambers or apparatus for oxydizing is
either quicker or may be done at a lower temperature, in consequence of the more
rapid desiccation of the fibre.
4. The formation at the moment of desiccation of the fibre or better, during
the concentration of the mordant on the fibre, of a certain quantity of formic
aldehyde resulting from the action of the oxydizers on the alcohol, the moderating
power of which for the oxydizing is well known constitutes a natural protection
for the fibre and leaves to this latter a remarkably greater solidity than with
mordanting in aqueous mordants.
Dated this 13th day of November 1897
HERBERT HADDAN & Co.,
Agents to Applicants.

page_text: COME DEI DI MUIFICATION.
An Improved Process for Mordanting Cotton for Aniline Black.
We, ADOLPHE CLEMENT MAROT, Dyer, and ANTOINE BONNET, Chemist, both of
Troyes, in the Republic of France, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
Mordanting of cotton for dyeing with aniline black with oxidation has been
done as well for cotton in hanks as for cotton in the loose or in piece, after the
fibre has been boiled for a convenient time.
For cotton in hanks the boiling is also most frequently followed by rincing
and even drying before passing it into the appropriate mordant.
We avoid this preliminary work of preparation of the cotton, by modifying
the composition of the mordants used, not in the amount in active materials such
as aniline salt and oxydizing products, but we modify their amount in water.
We replace a certain quantity of water used with the mordant by a correspond-
ing quantity of alcohol, and we obtain in the mordanting bath, a perfect im-
pregnation of the unboiled cotton.
We use preferably methylic alcohol of 90 degrees strength on account of its
low price and use about a fifth of the total quantity of the liquid; but this pro-
portion is not absolute and we may either increase it or diminish it according
to desire and especially when the special composition of the mordant allows of
heating during the operation of mordanting.
Independently from the economy of work and steam which our process of mor-
danting effects we must mention the following advantages of the use of the
alcoholized mordants.
1. The unboiled fibre gives on the dynamometer a resistance always superior
to that of boiled cotton; the surplus of resistance attains and surpasses some
times 6 per cent. and we preserve it by mordanting directly unboiled cotton.
2. The fineness of the fibre, its silky qualities, its softness, and especially its
regularity are better preserved by the suppression of the boiling, than by mor-
danting on boiled fibre.
3. The oxidizing of the cotton in chambers or apparatus for oxidizing is either
quicker or may be done at a lower temperature in consequence of the more rapid.
desiccation of the fibre.
4. The formation at the moment of desiccation of the fibre or better during the
concentration of the mordant on the fibre of a certain quantity of formic alde-
hyde resulting from the action of the oxydizers on the alcohol, the moderating
power of which for the oxydizing is well known constitutes a natural protection
for the fibre and leaves to this latter a remarkably greater solidity than with
mordanting in the aqueous mordants.
Having now particularly described and ascertained the nature of this in-
vention and in what manner the same is to be performed we declare that what
we claim is: -
1. An improved process of mordanting cotton in hanks, in pieces or in the
loose, consisting in passing unboiled cotton directly into alcoholized mordants
in order to obtain the same or a superior effect to that obtained in the mordant-

page_text: ing in aqueous mordants of previously boiled cotton while suppressing the pre-
liminary boiling of the cotton substantially as described.
2. In the mordanting of unboiled cotton the use of methylic alcohol in com-
bination with the mordant used substantially as described.
n
1
100
1000
HERBERT HADDAN & Co.,
Agents to Applicants, 18, Buckingham Street, W.C.