Improvements in the Manufacture of Sulpho-acids of the Naph- thalene Series, and of Colouring Matters Derived therefrom.
Year: 1895

page_text: Date of Application, 18th Nov., 1895
Complete Specification Left, 23rd July, 1896-Accepted, 29th Aug., 1896
PROVISIONAL SPECIFICATION.
[Communicated from abroad by FARBWERK MÜHLHEIM, of Mühlheim on the
Main, in the Empire of Germany.]
Improvements in the Manufacture of Sulpho-acids of the Naph-
thalene Series, and of Colouring Matters Derived therefrom.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, do hereby declare
the nature of this invention to be as follows:-
:-
The communicators have found that the amidonaphtholdisulphoacid which is
produced by sulphonating the amidonaphthol monosulphoacid derived from the
a-naphthylamine-3-8-disulphoacid, can be transformed into a dioxynaphthalene-
disulphoacid, which appears to be identical with the one described in the
Specification of former Letters Patent No. 17141°³.
This transformation is effected best by heating the amidonaphtholdisulphoacid
with alcalies at a high temperature. This dioxynaphthalenedisulphoacid when
combined with diazo or tetrazo bodies yields very valuable azodyestuffs. The
communicators have further found that such azodyestuffs can also be obtained by
first producing azodyestuffs from the above mentioned amidonapht boldisulphoacid
and transforming these azodyestuffs into the corresponding dioxynaphthalenedye-
stuffs by heating them with alcalies or acids; but a treatment with nitrous acid
will also give results.
Dated this 18th day of November 1895.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in the Manufacture of Sulpho-acids of the Naph-
thalene Series, and of Colouring Matters Derived therefrom.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 45 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:
The amidonaphtholdisulphoacid B which (according to former Patent No. 19253")
is produced by sulphonating the 1.8 amidonaphthol-3-sulphoacid (obtained by
melting a-naphthylamine-3.8 disulphoacid with alkalies), can be transformed into
a dioxynaphthalenedisulphoacid which is identical with that described in the
Specification of former Patent No. 17141c³.
Likewise, azodyestuffs derived from the before mentioned acid B can be
transformed into the corresponding dioxy dyestuffs.
Whilst the first mentioned transformation is only effected by the action of
alkalies, the last mentioned transformation also takes place by the influence of
mineralic acids.

page_text: consists in heating 1-8 amidonaphthol 3-5 disulphoacid (B) of former Patent
No. 19253 with alkalies, substantially as hereinbefore described.
2. 1.8 dioxynaphthalene 4-6 disulphoacid produced as claimed under the
1st claiming clause.
3. The process of producing azodyes deriving from 1.8 dioxynaphthalene
4.6 disulphoacid which process consists in treating azodyes deriving from
1.8 amidonaphthol 3.5-disulphoacid (B) of former Patent No. 192530s with
mineralic acids or alkalies substantially as hereinbefore described.
4. Monoazodyes deriving from 1.8 dioxynaphthalene 4.6 disulphoacid and
produced as claimed under the 3rd claiming clause.
Dated this 23rd day of July 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.