Manufacture of New Monoazo-dyestuffs for Wool.
Year: 1899

page_text: VAN DE MOTIVATION.
Manufacture of New Monoazo-dyestuffs for Wool.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings,
Chancery Lane, in the County of London, Chartered Patent Agent, do hereby
declare the nature of this invention (as communicated to me from abroad by The
Farbwerke vormals: Meister Lucius and Brüning, of Hoechst a/Main, in the
Empire of Germany, Chemical Manufacturers,) to be as follows:-
Red to violet monoazo dyestuffs for wool have been obtained from acetylised
amidonaphtholsulphonic acids.
My foreign correspondents have found that by combining these acetylised
amidonaphtholsulphonic acids with diazotised picramic acid, black dyestuffs for
wool may also be obtained, which are characterized by the superior fastness of
their dyes.
Good results are obtained particularly with 1:8:3:6 and 1:8:4:6 acetylamido-
naphtholdisulphonic acids.
:-
The process is illustrated by the following example:-
Picramic acid is diazotised in the usual manner and the diazo compound is
introduced into a soda alkaline solution of an equivalent quantity of 1:8:3:6
acetylamidonaphtholdisulphonic acid. After standing for some hours the solu-
tion is salted out, pressed and dried.
The dyestuff dyes wool black and may be developed to a dark olive green on
treatment with chrome.
The dyes exhibit a much greater fastness to light than those obtained with
the corresponding dyestuff from not acetylised amidonaphtholdisulphonic acid.
Dated this 21st day of January 1899.
ADEL & IMKAY,
Agents for the Applicant.
Manufacture of New Monoazo-dyestuffs for Wool.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings,
Chancery Lane, in the County of London, Chartered Patent Agent, do hereby
declare the nature of this invention (as communicated to me from abroad by The
Farbwerke vormals: Meister Lucius and Brüning, of Hoechst a/Main, in the
Empire of Germany, Chemical Manufacturers,) and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement:―
Red to violet monoazo-dyestuffs for wool have been obtained from acetylised
amidona
tholsulphonic acids

page_text: My foreign correspondents have found that by combining these acetylised
amidonaphtholsulphonic acids with diazotised picramic acid, black dyestuffs for
wool may also be obtained, which are characterised by the superior "fastness of
their dyes.
Good results are obtained particularly with 1:8:3:6 or 1:8:4:6 acetylamido-
naphtholdisulphonic acid.
The process is illustrated by the following example; —
Picramic acid is diazotised in the usual manner and the diazo-compound is
introduced into a soda alkaline solution of an equivalent quantity of 1:8:3:6
acetylamidonaphtholdisulphonic acid. After standing for some hours the dye-
stuff is salted out, pressed and dried.
The dyestuff dyes wool black and may be developed to a dark olive green on
treatment with chromium compounds.
The dyes exhibit a much greater fastness to light than those obtained with
the corresponding dyestuff from not acetylised amidonaphtholdisulphonic acid.
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 manufacture of new monoazo-dyestuffs dyeing wool
black shades by combining diazotised picramic acid with 1:8:3:6 er 1:8:4:6
acetylamidonaphtholdisulphonic acid.
2. The dyestuffs manufactured as above set forth.