Improvements in the Manufacture of Fast Dyestuffs for Printing and Dyeing.
Year: 1890

page_text: Date of Application, 1st Mar., 1890
Complete Specification Left, 31st Dec., 1890-Accepted, 31st Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Fast Dyestuffs for Printing
and Dyeing.
I, BENJAMIN WILLCOX of 47 Lincoln's Inn Fields in the County of Middle-
sex, Patent Agent, do hereby declare the nature of this invention (which has been
communicated to me from abroad by the Farbenfabriken vormals Friedrich
Bayer & Co. of Elberfeld in the Empire of Germany) to be as follows:-
Mordant dyeing azo colouring matters can be obtained by coupling diazo com-
pounds of amido carbon acids with a certain number of dyestuff components so as to
directly obtain useful products or by further diazotising colouring matters (obtained
by combining the diazo compounds of those amido carbon acids with alpha naphthyl-
amine or alpha amido beta naphthol ether) and causing the diazo compounds
obtained to react upon suitable dyestuff components.
My foreign correspondents have now discovered that the dyestuff components so
employed in the reaction of the diazo compounds of the amido azo carbon acid
dyestuffs can be replaced with the same effect that is to say with the production of
technically valuable products, by amido naphthol sulpho acids such as are obtained
by melting the beta naphthylamine disulpho acids described in the Specification to
the German Patent No. 3229 or the alpha naphthylamine disulpho acid described
in the Specification to the German Patent No. 40571. These acids partaking of
the nature of an amine as well as of a phenol can be coupled either in an acetic
acid or in an alkaline solution. Two groups of dyestuffs or colouring matters are
thus obtained which differ greatly from one another in their shades or colours. The
colouring obtained with the acetic acid solution are of a considerably redder nature
than those obtained with the alkaline solution.
Of these amido naphthol sulpho acids the beta amido naphthol mono sulpho
acid G from the beta naphthylamine disulpho acid G of the German Patent
Specification No. 3229 affords the darkest colours. Considerably redder colours
are obtained with the corresponding beta amido naphthol mono sulpho acid R and
very blue colouring matters are obtained with the alpha amido naphthol mono
sulpho acid derived from the alpha naphthylamine disulpho acid of the German
Patent Specification No. 40571.
Regarding their other properties the new colouring matters resemble those of
other mordant dyeing colouring matters of the same class. The process for their
manufacture is of the usual description and may be illustrated by the following
examples.
FIRST EXAMPLE.
The diazo compound of the colouring matter amido naphthaline azo salicylic
acid containing 5 kilos. of nitrite is introduced into an alkaline solution of 20 kilos.
of alpha amido naphthol mono sulpho acid S. A blue black colouring matter
results which dyes chrome mordanted cotton an intense blue black.
SECOND EXAMPLE.

page_text: Improvements in the Manufacture of Fast Dyestuffs for Printing
and Dyeing.
I, BENJAMIN WILLCOX of 47 Lincoln's Inn Fields in the County of Middle-
sex, Patent Agent do hereby declare the nature of this invention which has been
communicated to me from abroad by the Farbenfabriken vormals Friedrich
Bayer & Co. of Elberfeld in the Empire of Germany, and in what manner the
same is to be performed to be particularly described and ascertained in and by
the following statement:-
Mordant dyeing azo colouring matters can be obtained according to the invention
described in the Specification of Letters Patent No. 8299 of 1889, and in the
Complete Specification of the application for Letters Patent 1828 of 1890 by
coupling diazo compounds of amido carboxy acids with certain dyestuff components
so as to directly obtain useful products or by further diazotizing the colouring
matters which are obtained by combining the diazo compounds of the amido-carboxy
acids with alpha naphthylamine or alpha- amido- beta-naphthol ethers and causing
the diazo compounds so obtained to react upon suitable dyestuff components.
My foreign correspondents have now discovered that the dyestuff components so
employed in treating the diazo compounds of the amido azo carboxy acid dyestuffs
can be replaced with the same effect that is to say so as to produce technically
valuable products by amido naphthol sulpho acids such as are obtained by melting
the beta naphthylamine disulpho acids described in the Specification of the German
Patent No. 3229.
As these acids possess the properties of amines as well as of phenols they can be
coupled either in an acetic acid solution or in an alkaline solution. Two groups of
dyestuffs or colouring matters are thus obtained which differ from one another in
shade or colour. The colouring matters obtained in an acetic acid solution are of
a redder nature than those obtained in an alkaline solution.
Of these amido naphthol sulpho acids the beta amido naphthol mono sulpho
acid G from the naphthylamine disulpho acid G of the German Patent Specification
No. 3229 affords the darkest colours. Considerably redder colours are obtained
from the corresponding beta amido naphthol mono sulpho acid R.
Regarding their other properties the new colouring matters resemble those of
other mordant dyeing colouring matters of the same class. The process for their
manufacture is of the usual description and may be illustrated by the following
examples.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
I. The process for the manufacture of azo colouring matters for dyeing and
printing by combining amido carboxy acids; that is to say-
Amido benzoic acids,
Amido hydroxy benzoic acids,
Amido cresolcarboxy acids,
Amido phthalic acids,
Amido sulpho benzoic acids,
Amido sulpho salicylic acids,
:
Amido sulpho cresolcarboxy acids,
Amido anisic acids,
with one molecular proportion of alpha naphthylamine or of an alpha amido beta
naphthol ether again diazotising the resulting amido azo compounds and combining
the new diazo compounds with the amido naphthol mono sulpho acids G or R in an
acetic acid or an alkaline solution.
II. As new articles of manufacture the products of the foregoing claiming
clause.