Improvements in the Manufacture or Production of Coloring Matters.
Year: 1897

page_text: Date of Application, 28th Apr, 1897
Complete Specification Left, 27th Jan., 1898-Accepted, 2nd Apr., 1898
[Communicated from abroad by THE FARBENFABRIKEN VORMALS, FRIEDRICH
BAYER & Co., of Elberfeld, Germany.]
Improvements in the Manufacture or Production of Coloring 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 to be as follows:-
My foreign correspondents have found that, on combining in equimolecular
proportions, the diazo derivatives of the so-called periamido naphtholsulphonic
acids with the 1·5 amidonaphthol 6 or 7 monosulphonic acid, dye-stuffs are
obtained, which are capable of dyeing wool in acid baths fast blue shades.
In order to illustrate this new process, the following example is given, the parts
being by weight.
EXAMPLE.
31:9 parts of the 1.8 amidonaphthol-3 6-disulphonic acid are diazotized
in the well known manner by means of 69 parts of sodium nitrite. The diazo-
compound, separating in the form of yellow needles, is filtered off, and transformed
into a liquid paste by the addition of water. This paste is added (with stirring)
to a solution of 25 parts of the 1:5 amidonaphthol--7-monosulphonic acid, and
50 parts of sodium acetate, in 1500 parts of water. After about 24 hours, the
formation of the colouring matter is finished, almost the whole dye-stuff being
separated. The precipitation of the coloring matter is completed by the addition
of common salt, and then the dye-stuff is filtered off, dried, and pulverized.-In a
dry state, it represents a dark powder with a bronze-like lustre. It dyes wool,
in acid baths, pure greenish-blue fast shades.
Similar dye-stuffs are obtained if, in place of the 1:8-amidonaphthol-3:6
disulphonic acid, other so-called periamidonaphthol sulphonic acids, such as
1.8 amidonaphthol-4 6-disulphonic acid, 1.8 amidonaphthol-2-4-disul-
phonic acid, 18-amidonaphthol -35 disulphonic acid, 1-8--amidonaphthol
4-sulphonic acid, 1.8 amidonaphthol-3-sulphonic acid, 1.8 amidonaphthol
-5-sulphonic acid, or the like, are employed, or if, instead of the 1:5 amido-
naphthol 7-monosulphonic acid, the 1:5 amidonaphthol-6-monosulphonic
acid is used in the above example.
Of course, this example is merely typical and my foreign correspondents do not
limit themselves to the particulars therein given, as these can be varied within
wide limits. Thus, for instance, the combination of the diazo compound with the
amidonaphtholsulphonic acid, can be carried out either in an acid or in a neutral

page_text: solution, and it can also be performed in a weak alkaline solution, though perhaps
less profitably.
-
Dated 1
001
T
A
וי
1007
NEWTON & SON,
Agents for the Applicants.
Improvements in the Manufacture or Production of Coloring 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 have found that, on combining in equimolecular
proportions the diazo derivatives of the so-called periamido naphthol sulphonic-
acids with the 15 amidonaphthol-6-or 7 monosulphonic acid, dye-stuffs. are
obtained which are capable of dyeing wool in acid baths fast blue shades.
In order to illustrate this new process, the following example is given, the parts
being by weight.
EXAMPLE.
31.9 parts of the 1:8 amidonaphthol-3 6-disulphonic acid are diazotized
in the well known manner by means of 6-9 parts of sodium nitrite. The diazo
compound separating in the form of yellow needles, is filtered off, and transformed
into a liquid paste by the addition of water. This paste is added (with stirring)
to a solution of 23'9 parts of the 15 amidonaphthol-7-monosulphonic acid, and
50 parts of sodium acetate, in 1500 parts of water. After about 24 hours, the
formation of the colouring-matter is finished, almost the whole of the dye stuff
being separated. The precipitation of the colouring-matter is completed by the
addition of common salt, and then the dye-stuff is filtered off, dried, and pulverized,
forming when in a dry state, a dark powder with a bronze-like lustre, which will
dye wool in acid baths well defined greenish-blue fast shades.
Similar dye-stuffs are obtained if, in place of the 18 amidonaphthol 3.6-
disulphonic acid, other so-called periamido naphthol sulphonic acids, such as 1.8
amido naphthol 4-6 disulphonic acid, 1:8 amido naphthol 2.4 disulphonic acid,
1.8 amido naphthol 3-5 disulphonic acid, 1:8 amido naphthol 4 sulphonic
acid, 18 amidonaphthol 3-sulphonic acid. 1.8 amido naphthol 5-sulphonic acid,
or the like, are employed, or if, instead of the 1-5 amidonaphthol 7-mono sul-
phonic acid, the 1:5 amidonaphthol 6-mono sulphonic acid is used in the above
example.
The above example is merely typical, and my foreign correspondents do not limit
themselves to the particulars therein given, as these can be varied within wide
limits for instance, the combination of the diazo compound with the amido
naphthol sulphonic acid can he carried out either in an acid or in a neutral solution.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, as communicated to
me from abroad, I declare that what I claim is:-
1. The process for producing new monoazo dye-stuffs, which consists in com-
bining one molecule of the diazo derivative of a so-called periamido naphthol
sulphonic acid, with one molecule of 1:5 amido naphthol-6-mono sulphonic

page_text: acid, or 1:5 amido naphthol 7 monosulpho acid, substantially as hereinbefore
described.
2. As new articles of manufacture, the new dye-stuffs obtained by the process
referred to in Claim 1.
Dated this 27th day of January 1898
NEWTON & SON,
Agents for the Applicant.