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 about 5° C. with a solution of
14 kilos. sodium nitrite.
When the tetrazo compound is formed, the liquor is run into a solution of
.35 kilos. dioxynaphthöic mono sulpho acid and 2 kilos. of soda ash. After the
formation of the intermediate compound, 25 kilos. of the sodic salt of the naphthol
sulpho acid. a, a, are added. The formation of the colouring matter is completed
in 24 to 48 hours.
The liquor is then heated by steam and the dye stuff is precipitated by salt,
filtered and dried.
It dyes unmordanted cotton a violet-blue.
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 herein described process for the manufacture of a new dioxynaphthöic
disulpho acid by melting alpha oxynaphthöic disulpho acid (OH COOH SO, H
SO, H = 1. 2. 4. 7) with a caustic alkali at a temperature of 180 to 200° C.
2. The herein described process for the manufacture of intermediate products,
containing still one free diazo group, by the combination of one molecule of the
new dioxynaphthöic mono sulpho acid with one molecule of a tetrazo body such as:
Tetrazodiphenyl or its homologue,
Ether of tetrazo oxydiphenyl,
Ether of tetrazodioxydiphenyl,

page_text: The herein described process for the manufacture of colouring matters by
bination of the intermediate compounds referred to in the preceding claim
h:
1 molecule of the monosulpho acid of the a-naphthylamine (a1-a,)
1 molecule of the monosulpho acid of the a-naphthol (a1-a2)
1 molecule of the monosulpho acid of the 6-naphthol (Schäffer)
1 molecule of the monosulpho acid of the ẞ-naphthol (F)
1 molecule of the disulpho acid of the B-naphthol (R)
1 molecule of the disulpho acid of the ẞ-naphthol (F)
1 molecule of the dioxynaphthalene mouosulpho acids, 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 No. 44070.
1 molecule of the dioxynaphthalene mono-sulpho acid (1. 7. 4)
1 molecule of the mono and disulpho acids of the amidonaphthol (a₁-as)
1 molecule of the mono and disulpho acids of the dioxynaphthalene (a; a)
1 molecule of the dioxynaphthöic sulpho acid of the German Patent
No. 67000
1 molecule of the new dioxynaphthöic mono sulpho acid (first claim)
1 molecule of the ẞ amidonaphthol y-sulpho acid.
The herein described process for the manufacture of the colouring matters by
bination of one molecule of the sulpho acids referred to in Claim 3 with one of
tetrazo compounds mentioned in Claim 2 and by combination of the intermediate
ies prepared with the new dioxynaphthöic monosulpho acid.
The new products herein described, namely the dioxynaphthöic monosulpho
1, the intermediate products and the colouring matters derived from the said
xynaphthöic monosulpho acid.
Dated this 5th day of March 1894
ABEL & IMRAY,
Agents for the Applicant.