The Manufacture and Production of New Disazo Dies on Cotton."
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
"The Manufacture and Production of New Disazo Dies on Cotton."
I JAMES YATE JOHNSON of 47 Lincolns Inn Fields in the County of London,
Gentleman, do hereby declare the nature of this Invention (which has been
communicated to me from Abroad by the Badische Anilin & Soda Fabrik of
Ludwigshafen-on-Rhine, in the Empire of Germany) to be as follows:-
In the Specification of Letters Patent N° 18317 of 1893 the manufacture and
produced of new diazo-dyes from 1.4' naphthylene-diamine are described. These.
dyes are obtained by combining the said naphthylene-diamine with two mole-
cular proportions of the same diazo compound or of two different diazo-compounds
derived from primary aromatic amines, or the sulpho-acids. The dyes so
obtained yield bluish to black shades on animal fibre, which shades are very
fast against fulling. To these primary aromatic amines belong of course also
primuline and its analogues.
My foreign correspondents have now found that very fast black shades on cotton
be obtained by combining the diazo derivatives of primuline or its
analogues with the 1.4 or 1.1' naphthylene-di-amine or mixtures thereof on the
can
fibre.
The dyes so produced on. the fibre differ very remarkably from those obtained
off the fibre by their solubility as the first are not dissolved even by boiling with
dilute soda solution while the latter dissolve with a red colour even when
warmed with dilute soda solution.
The following example will serve to further illustrate the nature of the inven-
tion which is however not confined to the said example. The parts are by weight.
EXAMPLE.
Dye the cotton in the well-known manner with primuline (four per cent of the
weight of the goods) and diazotize in the well known way. Introduce one hundred
parts (dry weight) of the goods so prepared into a developing bath made from
two parts of the chlorhydrate of 1.41 naphthylene diamine and one thousand five
hundred parts of water, turn for about half an hour wash and dry.
By using 1.1 naphthylene-diamine instead of 1.4 naphthylene-diamine in the
foregoing example a black with a more greenish shade is obtained. When a
mixture of 1.4 naphthylene-diamine and 1.1' naphthylene-diamine is applied a
neutral black will be produced.
Doted this 3rd day of Wah 1807
JOHNSONS & WILLCOX
47 Lincolns Inn Fields London W.Ć. Agents.

page_text: "The Manufacture and Production of New Disazo Dies on Cotton."
I, JAMES YATE JOHNSON, of 47 Lincolns Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been
communicated to me from abroad by The Badische Anilin and Soda Fabrik of
Ludwigshafen-on-Rhine, in the Empire of Germany) 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 of Letters Patent N° 18317 of 1893 the manufacture and
production of new disazo-dyes from 1.4'-naphthylene-diamine are described. These
dyes are obtained by combining the said naphthylene-diamine with two mole-
cular proportions of the same diazo-compound, or of two different diazo-compounds,
derived from primary aromatic amines, or their sulpho-acids. The dyes so
obtained yield bluish to black shades on animal fibre, which shades are very
fast against fulling. To these primary aromatic amines belong of course also
primuline and its analogues.
My foreign correspondents have now found that very fast black shades can be
obtained on cotton by combining the diazo-derivatives of primuline, or its
analogues, with the 1.44,- or 1.1',- naphthylene-diamine, or mixtures thereof on
the fibre.
The dyes so produced on the fibre differ very remarkably from those obtained
off the fibre by their solubility, as the first are not dissolved, even by boiling with
dilute soda solution, while the latter dissolve with a red colour even when
warmed with dilute soda solution.
The following example will serve to further illustrate the nature of the inven-
tion and the manner in which it can be performed. The invention is however
not confined to the said example. The parts are by weight.
EXAMPLE.
Dye the cotton in the well-known manner with primuline (four per cent. of the
weight of the goods) and diazotize in the well-known way. Introduce one hundred
parts (dry weight) of the goods so prepared into a developing bath made from
two parts of the chlorhydrate of 1.4-naphthylene-diamine and one thousand five
hundred parts of water, turn for about half an hour wash and dry.
By using 1.1-naphthylene-diamine instead of 1.4'-naphthylene-diamine in the
foregoing example a black having a more greenish shade is obtained. When a
mixture of 1.42-naphthylene-diamine and 1.1' naphthylene-diamine is used, a
neutral black will be produced.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The manufacture of new black disazo-dyes on cotton by the combination of
the diazo-derivatives of primuline, or its analogues, with the 1.4'-naphthylene-
diamine on the fibre, substantially as hereinbefore described.
2. The manufacture of new black disazo-dyes on cotton by the combination of
the diazo-derivatives of primuline, or its analogues, with the 1.1'-naphthylene-
diamine, on the fibre, substantially as herein before described.
3. The manufacture of new black disazo-dyes on cotton by the combination of
the diazo-derivatives of primuline, or its analogues, with a mixture of the 1.4'-
and 1.1-naphthylene-diamine on the fibre, substantially as hereinbefore described,

page_text: D
4. The manufacture and production of new black disazo-dyes on cotton by the
combination of the diazo-derivatives of primuline or its analogues with the 1.41
or 1.1'-naphthylene-diamine or a mixture thereof substantially as described in
the foregoing example.
Dated this 30th day of October 1807
JOHNSONS & WILLCOX
47 Lincoln's Inn Fields, London, W.C., Agents.