Production of New Basic Blue Coloring Matters.
Year: 1890

page_text: Date of Application, 5th May, 1890
Complete Specification Left, 2nd Feb., 1891-Accepted, 7th Mar., 1891
TRUVIDIONAL DIECIFICATION.
Production of New Basic Blue Coloring Matters.
I, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman (a communica-
tion to me from abroad by Leopold Cassella and Company, of Frankfort-on-
Main, in the Empire of Germany, Chemists), do hereby declare the nature of this
invention to be as follows:-
My correspondents have found that by the action of the secondary bases of the series
of fat bodies as dimethylamine, diethylamine upon the coloring matters belonging to
the class of the oxazines, new bases are formed which by oxidation are transformed
into blue coloring matters, producing purer and greener shades than the primary
coloring matters from which they are essentially distinguished by their greater
resistance to alkalies, possessing the characteristical fastness of the oxazines
against the action of light.
Under the name of "New-Blues" my correspondents have since 1883 introduced
on the markets the coloring matters, first mentioned by Meldola, which are
produced by the action of nitrosodimethylaniline or nitrosodiethylaniline upon
B naphtol, which may be designated by the chemical expression: dimethyl- or
diethyl-amidonaphtoplienoxazine-chloride. In the following I first describe the
transformation of these coloring matters.
Example: 32 kilogrammes of pure new blue R (dimethylamidonaphtophen-
oxazine-chloride) are powdered and mixed with an aqueous solution containing
about 30-40% of dimethylamine. After a short time all of the coloring matter
will be transformed into a slightly colored greenish body, difficultly soluble in
water but soluble in diluted hydrochloric acid; this body is oxidized by stirring
during several days in a current of air at a temperature of 15° Centigrades until
the mass has become dry. The oxidation is terminated as soon as a sample
dissolves in hot water almost without residue with a blue color. Then the product
is introduced into 1000 litres water neutralized with hydrochloric acid, filtered,
cooled down to about 15° C. and precipitated with common salt.
The coloring
matter separates in fine green needles, it dyes cotton mordanted with tannin a very
pure greenish blue, fast to soaping and light-it dyes wool in neutral or acid
bath a deep blue.
Similar products are produced when diethylamine or diethylamidonaphtophen-
oxazine-chloride are used in place of the corresponding bodies in the above
example.
In the place of the chloride other salts of the new blues or even their free bases
may be used.
The same reactions take place when dimethylamine is allowed to react upon
the bodies formed by the action of nitrosodimethylaniline or nitrosodiethylaniline
upon ẞ dioxynaphtaline (muscarine). The violet shade of these products is then
changed into a greenish blue.
Dated thin 5th day of May 1800

page_text: COMPLETE SPECIFICATION.
Production of New Basic Blue Coloring Matters.
1, SYDNEY PITT, of Sutton, in the County of Surrey, Gentleman (a com-
munication to me from abroad by Leopold Cassella and Company, of Frankfort-
on-Main, in the Empire of Germany, Chemists), 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 correspondents have found that by the netion of the secondary bases of
the series of fat holies as dimethylamine, diethylamine, upon the coloring matters
belonging to the class of the oxazines, such as new blue, inscarine, gallocyanine,
new bases are formed which by oxidation are transformed into blue coloring
matters, producing purer and greener shades than the primary coloring matters,
from which they are essentially distinguished by their greater resistance to alkalies,
possessing the characteristic fastness of the oxazines against the action of light.
Under the name of New Blues" my correspondents have since 1883 introduced
on the markets the coloring matters, first mentioned by Meldola, which are
produced by the action of nitro-odimethylaniline or nitrosodiethylaniline upon
naphtol, which may be designated by the chemical expression: dimethyl- or
diethyl-amidonaphtophenoxazine-chloride. In the following 1 first describe the
transformation of these coloring matters.
Example 32 kilogrammes of pure new blue R (dimethylamidonaphtophen-
oxazine-chloride) are powdered and mixed with an aqueous solution containing
about 30-40° of dimethylamine. After a short time all of the coloring matter
will be transformed into a lightly colored greenish boly, difficultly soluble in
water but soluble in diluted hydrochloric acid; this holy is oxidized by stirring
during several days in a current of air at a temperature of 15° Centigrade until
the mass has become dry. The oxidation is terminated as soon as a sample
dissolves in hot water almost without residue with a blue color. Then the
product is introduced into 1000 litres water neutralized with hydrochloric acid,
filtered, cooled down to about 15 C. and precipitated with common salt. The
coloring matter separates in fine green needles, it dyes cotton mordanted with
tannin a very pure greenish blue, fast to soaping and light-it dyes wool in neutral
or acid bath a deep blue.
Similar products are produced when diethylamine or diethylamidonaphtophen-
oxazine-chloride are used in place of the corresponding bodies in the above
example.
In the place of the chloride other salts of the new blues or even their free bases
may be used.
The same reactions take place when dimethylamine is allowed to react upon the
bodies formed by the action of nitrosodimethylaniline or nitrosodiethylaniline
upon dioxynaphtaline (muscarine) or gallic acid or its others (such for instance
as gallocyanine). The violet shade of these products is then changed into a
blue.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1st. In the production of new basic blue coloring matters substantially as
described, the process of treating oxazines (new blue, muscarine, gallocyanine)
with a secondary base of the series of fat bodies.
2nd. The new coloring matters obtained by the means herein described.
CARPMAEL & Co.,
Agents for the Applicant.