AN IMPROVED MANUFACTURE OF GREEN COLOURING MATTER
Year: 1879

page_text: LETTERS PATENT to Henry Harris Lake, of the Office of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for the Invention of
"AN IMPROVED MANUFACTURE OF GREEN COLOURING MATTER." A commu-
nication from abroad by Messieurs Bindschedler and Busch, of Basle,
Switzerland
PROVISIONAL SPECIFICATION left by the said Henry Harris Lake at the
Office of the Commissioners of Patents on the 23rd June 1879.
HENRY HARRIS LAKE, of the Office of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED MANUFACTURE OF GREEN
COLOURING MATTER." [A communication from abroad by Messieurs Bindschedler
and Busch, of Basle, Switzerland]
This Invention has for its object the manufacture of a new green coloring
matter by oxidation of the sulpho-acid of the tetramethyldiamidotriphenyl-
methan.
This new green coloring matter has principally the following important advantages
over any artificial green coloring matters hitherto known, that is to say :-
It stands in the dyeing bath much more acid, can be fixed on wool without the
intervention of any mordant, and also dyes considerably more yellow; it can
therefore most advantageously be applied to dyeing and printing.
The sulpho-acid of tetramethyldiamidotriphenylmethan is produced as follows,
that is to say-One hundred parts of tetramethyldiamidotriphenylmethan are
heated on the water bath, together with five hundred parts of English sulphuric
acid, or the equivalent quantity of fuming sulphuric acid, until a sample taken out
dissolves completely in boiling alkaline water. The solution is then poured into
water, and by neutralization with caustic soda the salt of sodium of the sulpho-acid
is obtained. This solution is subjected directly to oxidation.
The oxidation of the sulpho-acid of the tetramethyldiamidotriphenylmethan is
effected as follows, that is to say :—

page_text: The best results are obtained with the theoretical quantity of peroxide of lead or
manganese in their finest division, in a slightly acetic solution, for example. The
Boda salt solution of the sulpho-acid obtained from one hundred parts of tetramethyl-
diamidotriphenylmethan is slightly acidulated with acetic acid, and when cold seventy
five parts of peroxide of lead previously diluted in water are added. The precipitate
obtained in this manner is collected on a filter, neutralized by caustic diluted soda,
and filtered boiling. The concentrated solution separates in cooling the soda salt of
the new coloring matter. The free sulpho-acid is very easily obtained from soda
salt by treating it with diluted muriatic acid.
The coloring matter is brought into the market in form of the free sulpho-acid or
one of its salts, and this either dried or as paste.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Harris Lake in the Great Seal Patent Office on the 22nd
December 1879.
HENRY HARRIS LAKE, of the Office of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "AN IMPROVED MANUFACTURE OF GREEN
COLOURING MATTER" A communication from abroad by Messieurs Bindschedler
and Busch, of Basle, Switzerland.
This Invention has for its object the manufacture of a new green coloring
matter by oxidation of the sulpho-acid of the tetramethyldiamidotriphenyl-
methan.
This now green coloring matter has principally the following important advantages
over any artificial green coloring matters hitherto known, that is to say:-
It may be subjected in the dyeing bath to the action of much more acid without
injury, can be fixed on wool without the intervention of any mordant, and also dyes
considerably more yellow. It can therefore most advantageously be applied to
dyeing and printing.
In the production of sulpho acid of tetramethyldiamidotriphenylmethan, one
bundred parts of tetramethyldiamidotriphenylmethan are heated in the water bath,
together with five hundred parts of English sulphuric acid, or the equivalent
quantity of fuming sulphuric acid, until a sample taken out dissolves completely
in boiling alkaline water. The solution is then poured into water, and by neutrali-
zation with caustic soda the salt of sodium of the sulpho-acid is obtained. This
solution is subjected directly to oxidation.
For the oxidation of the sulpho-acid of the tetramethyldiamidotriphenylmethan
the best results are obtained with the theoretical quantity of peroxide of lead or
manganese in their finest division, in a slightly acetic solution, for example. The
soda salt solution of the sulpho-acid obtained from one hundred parts of tetra-
methyldiamidotriphenylmethan is slightly acidulated with acetic acid, and when
cold seventy five parts of peroxide of lead, previously diluted in water, are added.
The precipitate obtained in this manner is collected in a filter neutralized by caustic
diluted soda, and filtered boiling. The concentrated solution separates in cooling
the soda salt of the new coloring matter. The free sulpho-acid is very easily
obtained from soda salt by treating it with diluted muriatic acid.
The coloring matter is brought into the market in the form of free sulpho-acid
or one of its salts, and either dried or as paste.
Having thus fully described the said Invention as communicated to me by my
foreign correspondents, and the manner of performing the same, I wish it understood
that I claim,
The production of a green coloring matter by oxidation of the sulpho-acid of the
tetramethyldiamidotriphenylmethan.
In witness whereof, I, the said Henry Harris Lake, have hereunto set my
hand and seal, this Twenty second day of December, in the year of our Lord
One thousand eight hundred and seventy nine.