Improvements in the Production of Blue-black Colouring Matters.
Year: 1889

page_text: Date of Application, 17th May, 1889
Complete Specification Left, 14th Feb., 1890--Accepted, 15th Mar., 1890
PROVISIONAL SPECIFICATION.
[Communicated from abroad by Messrs. WIRTH & Co., of Frankfort-on-the-Main,
acting as Agents of A. Leonhardt & Co., of Muhlheim-on-the-Main, both in
the Empire of Germany:]
Improvements in the Production of Blue-black Colouring Matters.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings in the County of Middlesex, do hereby declare the nature of
this invention to be as follows
This invention relates to an improved method of manufacturing blue-black
colouring matters by the reaction of aromatic nitroso-compounds on metaoxydiphenyl-
amines, these latter being produced, for instance, by heating resorcine with primary
amines of the aromatic series or in other ways well known to chemists.
It is preferable in practically carrying out this invention to take such proportions
of nitroso-compounds and metaoxydiphenylamines, that 3 molecules of the first
react upon one molecule of the latter and further to employ some dissolving or
distributing agent such as spirit, acetic acid or the like.
Thus for an example
16-8 kilos. of the hydrochlorate of nitrosodimethylaniline are heated with 5.6 kilos.
of metaoxydiphenylamine and 16 litres of spirit until the reaction is finished and all
the nitrosodimethylaniline has disappeared. The spirit is then distilled over, the
residue is dissolved in hot water slightly acidulated with muriatic acid and the
obtained solution is filtered and precipitated by means of common salt.
11
30
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Production of Blue-black Oolouring Matters.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings, in the County of Middlesex 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:-
This invention relates to an improved method of manufacturing blue-black
colouring matters by the action of the salts of Nitrous Derivatives of tertiary
aromatic amines on uneta oxidi-phenylamines, these being produced for instance, by
heating resorcine with primary amines of the aromatic series or in other suitable
ways.
In practically carrying out this invention it is preferable to take such proportions
of nitroso-compounds and metaoxydiphenylainines, that three molecules of the first
react upon one molecule of the latter.
The reaction takes place by heating the two components just mentioned in
presence of some dissolving or distributing agent, such as spirit, acetic acid, methylic
alcohol or the like.
For an example, I proceed as follows:
16-8 Kilos. of the hydrochlorate of nitroso-dimethylaniline are heated with
5-6 kilos. of meta oxydiphenylamine and 16 litres of spirit, until the reaction is
finished and all the nitroso-dimethylaniline has disappeared. The spirit is then
distilled over,
the residue is dissolved in hot water, slightly acidulated with

page_text: muriatic acid, and the solution obtained is filtered and precipitated by means of
common salt.
By substituting in this process, an equivalent quantity of nitrosodiethylaniline
for nitrosodimethylaniline, or an equivalent quantity of metaoxyphenyltolylamine or
metaoxyphenylxylylamine or ethoxymetaoxydiphenylamine for metaoxydiphenylamine,
colouring matters are produced the shades of which differ but slightly from the shade
of the colouring matter formed according to the example above given, so that
the homologous or substituted products of either nitrosodimethylaniline
metaoxydiphenylamine must be considered to be mere chemical equivalents of
nitrosodimethylaniline or metaoxydiphenylamine themselves.
ог
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 by my foreign correspondents I declare that what I claim is:
The process of manufacturing blue-black colouring matters by the action of the
salts of nitrosodimethylaniline or nitrosodiethylaniline on metaoxydiphenylamines,
substantially as hereinbefore described.
Dated Gifs 14th day of February 100.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant: