Manufacture of Colouring Matters.
Year: 1893

page_text: Date of Application, 7th Apr., 1893
Complete Specification Left, 8th Jan., 1894-Accepted, 10th Feb., 1894
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE FARBWERKE vormals MEISTER_Lucius
AND BRUNING, of Hoechst a Main, in the Empire of Germany, Chemical
Manufacturers.]
Manufacture of Colouring Matters.
I, OLIVER IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention to be as follows:-
In the Specification to application for Letters Patent No. 19820 of 1892 was
described the production of a red colouring matter by submitting rhodamine (the
hydrochlorate of tetraethyl- or tetramethyl-amido phenol-phthaleine) or rhod-
amine base (tetra-ethyl- or tetramethyl-amido-phenol-phthaleine) to the action of
meta dinitro chloro benzene in alcoholic solution under heating.
My correspondents have discovered that the chloronitro-derivatives of the
aromatic hydrocarbons such as for example dinitro-chloro-benzene, dinitro-chloro-
toluols, picrylchlorides, benzylchlorides &c. &c. act upon the dialkylised meta-
amido-phenol-phthaleines in an analogous manner as upon tetra-alkylised meta-
amido-phenol phthaleines as described in the said application No. 19820 of 1892,
forming novel red colouring matters, which, like the colouring matters described in
the said application, dye tanned cotton shades considerably faster to soap, than
those obtained by the dialkyl rhodamines themselves. They differ from the
colouring matters produced from tetra alkylised meta-amido-phenol-phthalëines in
that the shades they produce are yellower than are produced by these.
The manner of producing the colouring matters is more fully described in the
following example :
19.3 parts by weight of diethyl-meta-amido-phenol-phthalëine
dinitro chloro benzene
10.1
"
"
"
are heated in about 50 parts by weight of alcohol for 6 hours; the alcohol is
distilled off and the colouring matter is extracted from the residue by means of
boiling water mixed with a small quantity of hydrochloric acid. The colouring
matter is precipitated from the filtrate by means of common salt.
--Dated this 7th day of April 1893.
ABEL & IMRAY,
Agents for the Applicant.-
COMPLETE SPECIFICATION.
Manufacture of Colouring Matters.
1, OLIVER IMRAY of. No. 28 Southampton Buildings, Chancery Lane, in the
County of London, Chartered 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 :-
In the Specification No. 19820 of 1892 was described the production of a red
colouring matter by subjecting rhodamine (the hydrochlorate of tetra ethyl- or
tetra methyl-amido phenolphthaleine) or rhodamine base (tetraethyl- or tetra-
methyl amido-phenolphthaleine) to the action of meta-dinitro-chlorobenzene in
alcoholic solution under heating.

page_text: My correspondents have discovered that dinitro-chlorobenzene and ortho- and
para-nitro-benzyl-chlorides act upon the symmetric di-ethyl- or di-methyl-meta-
amido-phenol-phthaleïne or their hydrochlorates, upon the free colouring matter
bases without addition of alkali and upon their hydrochlorates with addition
of alkali-in alcoholic solution in an analogous manner as upon tetra-alkylised meta-
amido-phenolphthaleines as described in the Specification No. 19820 of 1892 above
referred to, forming novel red colouring matters which, like the colouring matters
described in the said Specification, dye tanned cotton shades fast to soap. They
differ from the colouring matters produced from tetra-alkylised meta-amido-phenol-
phthaleines in that the shades which they produce are considerably yellower than
are produced by these.
The nitro-rosamines derived from the dialkyl-rhodamines are soluble in alcohol,
acetic acid and in water with more difficulty than the corresponding tetra-alkyl
colouring matters.
The novel colouring matters dissolve in acetic acid of 50 per cent. and in alcohol
at ordinary temperature and in water on heating. Common salt precipitates the
colouring matter from its aqueous solution in the form of red floccules. The dry
colouring matter is in form of a light yellowish red powder with green metallic
lustre.
The manner of producing the colouring matters is more fully described in the
following examples
II.
19.3 kilos. of diethyl-meta-amido-phenol-phthaleine
of dinitro-chloro-benzene
10.1
"
are heated in 50 litres of alcohol for several hours; the alcohol is distilled off and
the colouring matter is extracted from the residue by means of a large quantity of
boiling water mixed with a small quantity of hydrochloric acid. The colouring
matter is precipitated from the filtrate by means of common salt.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :
1. The manufacture of colouring matters by heating the symmetric dimethyl- or
diethyl-meta-amido-phenol-phthaleine without alkali or their hydrochlorates with
addition of alkali, in alcoholic solution, with dinitro-chloro-benzene, or para- or
ortho-nitro-benzyl chloride, substantially as described.
2. The colouring matters manufactured as above set forth.
ABEL & IMRAY,
Agents for the Applicant.