IMPROVEMENTS IN THE PRODUCTION OF COLORING MATTERS
Year: 1881

page_text: LETTERS PATENT to Charles Denton Abel, of No. 28, Southampton
Buildings, Chancery Lane, in the County of Middlesex, for an Invention.
of "IMPROVEMENTS IN THE PRODUCTION OF COLORING MATTERS." A com-
munication from abroad by Messrs. Bindschedler and Busch, of Basle, in the
Republic of Switzerland.
PROVISIONAL SPECIFICATION left by the said Charles Denton Abel at the
Office of the Commissioners of Patents on the 4th March 1881.
CHARLES DENTON ABEL, of No. 28, Southampton Buildings, Chancery Lane, in
the County of Middlesex. "IMPROVEMENTS IN THE PRODUCTION OF COLORING
MATTERS." [A communication from abroad by Messrs. Bindschedler and Busch,
of Basle, in the Republic of Switzerland.]
The reaction between benzaldehyde and dimethylaniline, which leads to the
production of tetramethyldiamidotryphenylmethan forming the basis of the process
for the production of green colouring matter, as described in the Specification to
Lake's Patent, No. 2509, of 1879 (a communication from Messrs. Bindschedler
and Busch), is not limited to those two bodies, but is, according to the publications
of Dr. Otto Fischer, a general reaction between aldehydes and tertiary aromatic
bases.
In this sense also, as has been proved by my foreign correspondents by an
extended series of experiments, the said patented process for the conversion of
tetramethyldiamidotryphenylmethan into a sulpho acid, and the conversion of this
sulpho acid by oxidation into a green colouring matter, is quite a general process,
that is to say, it is generally applicable to the homologues and substitution
derivatives of the tetramethyldiamidotryphenylmethan.
These bodies may be obtained in various ways, namely,-
1. By condensation of the benzaldehyde and the dialkyl derivatives of aniline
and its homologues, for instance, of benzaldehyde and dimethylaniline, diethyl-
toluidine, dibenzylaniline, as also of methyldiphenylamine, and the like.
2. By condensation of the substitution derivatives of benzaldehyde upon the
group of bases referred to under (1), for instance, of salicylaldehyde, of nitro-
benzaldehyde, and the like.
3. By direct substitution of the methyl groups of the tetramethyldiamidotry-
phenylmethan by other alcohol-radicals by the action of the alkyl-halogenes, as,
for instance, of bromethyl, chlorbenzil, and the like.
4. By direct substitution of hydrophenyl in the tetramethyldiamidotryphenyl-
methan by halogene and nitro groups.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles Denton Abel in the Great Seal Patent Office on the
14th June 1881.
CHARLES DENTON ABEL, of No. 28, Southampton Buildings, Chancery Lane, in
the County of Middlesex. "IMPROVEMENTS IN THE PRODUCTION OF COLORING
MATTERS."
A communication from abroad by Messrs. Bindschedler and Busch,
of Basle, in the Republic of Switzerland.
The reaction between benzaldehyde and dimethylaniline, which leads to the
production of tetramethyldiamidotryphenylmethan, forming the basis of the process
for the production of green coloring matter, as described in the Specification to
Lake's Patent, No. 2509, of 1879 (a communication from Messrs. Bindschedler and
Busch), is not limited to. those two bodies, but is, according to the publications
of Dr. Otto Fischer, a general reaction between aldehydes and tertiary aromatic
bases.
In this sense also, as has been proved by my foreign correspondents by an
extended series of experiments, the said patented process for the conversion of
tetramethyldiamidotryphenylmethan into a sulpho-acid, and the conversion of this
sulpho-acid by oxidation into a green coloring matter, is quite a general process,
that is to say, it is generally applicable to the homologues and substitution
derivatives of the tetramethyldiamidotryphenylmethan.
These bodies may be obtained in various ways, namely,-
1. By condensation of the benzaldehyde and the dialkyl derivatives of aniline
and its homologues, for instance, of benzaldehyde and dimethylaniline, diethyl-
toluidine, dibenzylaniline, as also of methyldiphenylamine, and the like.
2. By condensation of the substitution derivatives of benzaldehyde upon the
group of bases referred to under (1), for instance, of salicylaldehyde, of nitro-
benzaldehyde, and the like.
3. By direct substitution of the methyl groups of the tetramethyldiamidotry-
phenylmethan or other alcohol-radicals by the action of the alkyl-halogenes, as, for
instance, of bromethyl, chlorbenzil, and the like.
4. By direct substitution of hydrophenyl in the tetramethyldiamidotryphenyl-
methan by halogene and nitro-groups.
Having thus described 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 claim,-
The production of green colouring matter by conversion of the homologues of
tetramethyldiamidotryphenylmethan or the substitution products thereof into a
sulpho-acid, and the treatment of this sulpho acid with oxidising bodies.
In witness whereof, I, the said Charles Denton Abel, have hereunto set my
hand and seal, this Fourteenth day of June, in the year of our Lord
One thousand eight hundred and eighty one.