Year: 1894

page_text: Date of Application, 5th Mar.. 1894-Accepted, 7th Apr., 1894

page_text: 21 kilos. tolidine dissolved in 500 litres of water and 55 kilos. concentrated
hydrochloric acid are diazotised at a temperature of 0° to 5° C. with a solution of
14 kilos. sodium nitrite.
When the tetrazo compound is formed, the liquor is run into a solution of
28 kilos. of the new dioxynaphthalene monosulpho acid and 20 kilos. of soda ash.
After the formation of the intermediate compound, 25 kilos. of the sodic salt of
the naphthol sulpho acid a-a2 are added.
The formation of the colouring matter is completed in 24 to 48 hours. The
liquor is then heated by steam and the dyestuff is precipitated by salt, filtered
and dried.
It dyes unmordanted cotton a violet blue.
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 herein described process for the manufacture of a new dioxynaphthalene
monosulpho acid (OH OH SO₂H = 1. 7. 4) by melting alpha oxynaphthoic
disulpho acid (OH COOH SO₂H SO,H = 1. 2. 4. 7) with caustic alkali at a
temperature of 230° to 290° C.
2. The herein described process for the preparation of intermediate products,
containing still one free group diazo, by the combination of one molecule of the
dioxynaphthalene monosulpho acid (OH OH SO,H = 1. 7. 4) with one molecule
of a tetrazo body such as:
Tetrazodiphenyl or its homologue
Ether of tetrazooxydiphenyl
Ether of tetrazodioxydiphenyl

page_text: 3. The herein described process for the preparation of colouring matters by
combination of the intermediate compounds referred to in the preceding claim
b:
1 molecule of the monosulpho acid of the a naphthylamine (a,-a₂)
1 molecule of the monosulpho acid of the a-naphthol (aa)
1 molecule of the monosulpho acid of the ẞ naphthol (Schaeffer)
1 molecule of the monosulpho acid of the ẞ naphthol F
1 molecule of the disulpho acid of the ẞ naphthol R
1 molecule of the disulpho acid of the ẞ naphthol F
1 molecule of the dioxynaphthalene monosulpho acid, made by alkaline
fusion of the following substances:
the naphtholdisulpho acids R and G of the German Patent No. 3229
the naphtholdisulpho acid E of the German Patent No. 45776
the betanaphtholdisulpho acid F of the German Patent 44070
1 molecule of the dioxynaphthalene monosulpho acid (1. 7. 4)
1 molecule of the mono and disulpho acids of the amidonaphthol a1-04
1 molecule of the mono and disulpho acids of the dioxynaphthalene a₁
1 molecule of the dioxynaphthoic sulpho acid of the German Patent
No. 67000
1 molecule of the ẞ-amidonaphthol y-sulpho-acid.
1. The herein described process for the preparation of the colouring matters by
nbination of one molecule of the sulpho acids referred to in Claim 3 with one
the tetrazo compounds mentioned in Claim 2 and by combination of the
ermediate bodies thus prepared with the new dioxynaphthalene monosulpho
d 1. 7. 4.
5. The new products herein described, namely the dioxynaphthalene monosulpho
d 1. 7. 4, the intermediate products, and the colouring matters derived from the
xynaphthalene monosulpho acid 1. 7. 4.
Dated this 5th day of March 1894.
ABEL & IMKAY,
Agents for the Applicant.