Improvements in the Manufacture of Blue dyestuffs Directly Dyeing Cotton.
Year: 1899

page_text: Date of Application, 6th July, 1899
Complete Specification Left, 5th Apr., 1900-Accepted, 5th May, 1900
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Blue dyestuffs Directly Dyeing
Cotton.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, in the County of London, Consulting Engineer and Chartered Patent Agent,
do hereby declare the nature of this invention (as communicated to me from
abroad by The Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the
Empire of Germany, Chemical Manufacturers), to be as follows:-
It is known that by boiling with alcohol the products obtained by heating
with sulphur and sulphides of alkali metals certain nitro-derivatives of oxy-
diphenylamine, such as their sulphonic or carboxylic acids, there are obtained
new colouring matters which directly dye cotton blue shades.
My foreign correspondents in carrying their researches farther have found
that blue colouring matters of quite analogous character can be produced by
boiling with alcohol the products which are obtained by heating with sulphur
and sulphides of alkali metals mixtures of equimolecular proportions of nitro-
derivatives of oxydiphenylamine and of parn-amidophenol or para- or meta-
phenylenediamine or their homologues.
The production of the new colouring matters from these raw materials is
effected in a manner quite analogous to that for the products obtained from
the nitro-derivatives of oxydiphenylamine alone.
L
ABEL & IMRAY,
Agents for the Applicants.
CODE BELL DEVIFICATION.
Improvements in the Manufacture of Blue dyestuffs Directly Dyeing
Cotton.
I, CHARLES DENTON ABEL, of Birkbeck Bank Chambers, Southampton Build-
ings, in the County of London, Consulting Engineer and Chartered Patent Agent,
do hereby declare the nature of this invention (as communicated to me from
abroad by The Actien Gesellschaft für Anilin Fabrikation, of Berlin, in the
Empire of Germany, Chemical Manufacturers); to be as follows:
It is known that by boiling with alcohol the products obtained by heating
with sulphur and sulphides of alkali metals certain nitro-derivatives of oxy-
diphenylamine, such as their sulphonic or carboxylic acids, there are obtained
new colouring matters which directly dye cotton blue shades.
D037

page_text: My foreign correspondents in carrying their researches farther have found
that blue colouring matters of quite analogous character can be produced by
boiling with alcohol the products which are obtained by heating with sulphur
and sulphides of alkali metals mixtures of equimolecular proportions of nitro-
derivatives of oxydiphenylamine and of para-amidophenol or para- or meta-
phenylenediamine or their homologues.
The production of the new colouring matters from these raw materials is
effected in a manner quite analogous to that for the products obtained from
the nitro-derivatives of oxydiphenylamine alone.
The following example may illustrate this invention :
1 part by weight of the product obtained by heating with sulphur and sulphides
of alkali metals an equimolecular mixture of dinitrooxydiphenylamine and para-
amidophenol (the manufacture of which is described in the Specification No. 13251
of 1899) is boiled with 10 parts of alcohol during several hours in a vessel con-
nected with a reflux condenser. The mother liquor is then filtered off. The
residue is dried, preferably in the open air, whereupon it can be directly used for
dyeing. It dyes unmordanted cotton fine blue shades.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that, what
I claim is
1. The herein described manufacture of blue dye stuff's directly dyeing cotton,
by extracting with alcohol and then drying the products obtained by heating
with sulphur aud sulphides of alkali-metals mixtures of equimolecular propor-
tions of nitro-derivatives of oxydiphenylamine and of para-amidophenol, para-
or meta-phenylenediamine or their homologues.
2. The dyestuffs manufactured as above set forth.
"