Year: 1894

page_text: Date of Application, 20th Apr., 1894
Complete Specification Left, 16th Jan., 1895-Accepted, 23rd Feb., 1895
PROVISIONAL SPECIFICATION.
[Communicated from abroad by THE ACTIEN GESELLSCHAFT FÜR ANILIN
FABRIKATION, of Berlin, in the Empire of Germany, Chemical Manu-
facturers.]
Mottota
Motoriala
My foreign correspondents have found that by nitrating the a₁ as ẞ naphthalene-
trisulphonic acid, there is formed, as chief product, a nitronaphthalene trisulpho
acid, which, treated with reducing agents, yields a new a naphthylamine trisulpho
acid, the constitution of which is most probably expressed by the following formula:
The nitration of the naphthalene-trisulpho-acid is carried out preferably in
sulphuric acid solution, to which the nitric acid mixed with sulphuric acid is slowly
added.
The product of nitration is poured into water and reduced, for instance, with
iron filings.
"
The naphthylamine-trisulpho acid is transformed in the well known manner into
the lime salt and sodium salt. From the concentrated solution of the latter the
acid sodium salt of the new naphthylamine trisulpho acid is precipitated by means
of hydrochloric acid.
Nitrous acid transforms the new acid into a diazo compound which yields
colouring matters when combined with amines, phenols and their sulpho acids.

page_text: and reactions is most probably a 1:8 amidonaphthol-disulpho acid of the following
constitution :
парному
are melted with 300 kilos. of caustic alkali and some water in an open or closed
vessel at 150° to 165° C. for 1 to 14 hours. The melt is then dissolved in such
a quantity of water and hydrochloric acid as to form a saturated, slightly acid,
salt solution from which, on cooling, the acid soda salt of the new amido
naphthol disulpho acid crystallises.
The new acid, that is to say, its acid-salt is readily soluble in hot water, less
soluble in cold water, insoluble in alcohol. The alkaline aqueous solution possesses
a blue fluorescence; with chloride of iron the acid produces a yellow brown
solution. Treated with nitric acid it yields a' dark yellow solution.
HII
The new acid combined with diazo and tetrazo bodies yields valuable dyestuffs.
a. In the first place the new amidonaphthol disulpho acid may be combined
with simple diazo bodies, such as, for instance, those derived from aniline and its
homologues, the carbo and sulpho acids of these bases, nitraniline and its homo-
logues, the naphthylamines and their sulpho-acids &c. The products obtained
in this way dye wool in an acidulated bath shades varying from red blue to violet.
b. My foreign correspondents have further discovered that the said new
amidonaphthol-disulpho acid also yields colouring matters when combined with
diazotised amido azo bodies.
Such amido azo bodies are, for instance, amido-ażo benzene and its homologues
and analogues or sulpho derivatives thereof.
The shades obtained by means of these dyes vary from violet red to dark
violet blue.
c. By combining the tetrazo derivatives of para-diamines (benzidine, tolidine &c.)
with two molecules of the new amido naphthol-disulpho acid, colouring matters may
be obtained, which dye, unmordanted cotton in an alkaline or in a salt bath. The
products are distinguished by their blue shades.
d. Instead of combining two molecules of the acid with tetrazotised paradiamines,
there may also be combiped with such tetrazo compounds oue molecule of the
above mentioned acid and one molecule of an amine, phenol or the carbo or sulpho
acids.
The, resulting products dye unmordanted cotton shades from grey-violet to
blue-black.
e. According to the further researches of my foreign correspondents valuable
dyestuffs that dye, direct are also obtained by combining with the new acid the
diazo derivatives of dehydro-thio-para-toluidine. dehydrothiometaxylidine, primuline
base and similar thio amido compounds or the sulphonic acid thereof.
The colouring matters obtained dye unmordanted cotton red-violet shades.
f. Colouring matters dyeing directly unmordanted cotton may also be obtained
by combining with the said new, acid the diazo products of the following products:
Amido-benzene-azo-a-naphthylamine, amido-benzene-azo-beta alkyl-oxy-alpha
naphthylamine, and analogous bodies or the sulpho or carbo acids thereof.

page_text: In this way colouring matters are produced, which dye unmordanted' cotton
blackish blue shades:
ABEL & IMRAY,
Agents for the Applicant.
COMI MULD
BOLTIVATION
Manufacture or Production of Colouring Matters, and Materials
therefor.
1, CHARLES DENTON ABEL, of No. 28 Southampton Buildings, Chancery
Lane, in the County of London, Consulting Engineer and 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 :-
My foreign correspondents, in their Provisional Specification filed on the
20th April 1894, described the production of what they believed to be a new
naphthylamine trisulpho acid and a new 1 : 8 amido-naphthol disulpho acid the
constitution of which latter has been found to be
a
Since filing the said Provisional Specification the production of this acid has
been described in the Specification of a Patent No. 17141c, of 1893.
My foreign correspondents therefore now limit the present invention to the
manufacture or production of certain diazo colouring matters from the acid above
referred to, which may properly be termed the 1: 8-amidonaphtholdisulpho acid,
illustrating the manufacture of these colouring matters by the following examples.
Example illustrates the production of colouring matters, which result by the
combination of the new acid with one molecular proportion of the diazo compound
of an amine of the benzene and naphthalene series or suitable substitution products
therefrom.
9-3 kilos. of aniline are diazotised in the usual way with 6.9 kilos. of sodium nitrite
and an excess of hydrochloric acid. The diazo solution obtained is poured into a
cold alkaline solution of 35 kilos. of the sodium salt of the 1: 8-amidonaphthol-
disulpho acid. The colouring matter thus formed is precipitated with salt, filtered
and dried.
It dyes wool from an acidulated bath blueish red.
Example 11 illustrates a result, found by iny foreign correspondents, that the
amidonaphtholdisulpho acid yields also valuable colouring matters when combined
with the diazo compounds of so called thioamido compounds, that is to say, dehydro-
thiotoluidine, dehydrothioxylidine, primuline base or their sulpho acids.
24 kilos. dehydrothiotoluidine of the melting point 191° C. are diazotised and
the diazo solution obtained is allowed to run into a cold solution of 36 kilos. of the
sodium salt of the 1: 8-amidonaphtholdisulpho acid. The whole is rendered
alkaline by means of carbonate of soda and the colouring matter is separated with
salt.
It dyes unmordanted cotton red-violet.

page_text: I
.Other azo dyestuffs, derived from the new acid, may be produced in a similar
manner according to the above examples with such modifications as are known to
chemists familiar with the preparation of azo-dyes.
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 or production of new azo-dyestuffs resulting from the
combination of 1: 8 amidonaphtholdisulpho acid with diazo-compounds, substantially
as hereinbefore described.
2. The new azo dyestuffs produced by the processes herein before set forth.
Dated this 12th day of January 1895.
ABEL & IMRAY,
Agents for the Applicant.