Improvements in and connected with Yellow Colouring Matters.
Year: 1894

page_text: Date of Application, 23rd June, 1894
Completa Sancification Loft
Lot Ane 1205 Locantod
L
A
1015
PROVISIONAL SPECIFICATION.
Improvements in and connected with Yellow Colouring Matters.
We, I. LEVINSTEIN & CO. LIMITED, and IVAN LEVINSTEIN both of the
Crumpsall Vale Chemical Works, Manchester in the County of Lancaster,
Chemical Manufacturers, do hereby declare the nature of this invention to be
as follows:-
Hitherto, the substitution of natural dye-stuff's such as fustic, Persian berries,
and the like, or their extracts, by coal tar colours, has not been successfully
accomplished. It is true that some of these colours, for example the so called
"alizarine yellows" and diamine yellow have found a certain amount of appli-
cation, but they have never yet really replaced to any material extent the natural
dyes, and this fact is principally due to the different solubility of these colouring
matters in water.
We have discovered that a yellow artificial colouring matter may be produced
which is very easily soluble in water and which produces, on a chrome mordant,
colours which are faster than those produced by the natural dye-stuffs.
This new colouring matter is obtained by combining, in quantitative proportions,
the diazo compound of 3-naphthylamine-gamma-disulpho acid with carbon acids
such as salicylic acid, meta-creosotic acid and the like. The product is a colouring
matter which is very easily soluble in water, and is remarkable for the fact that
although chemists would expect such a colour, on account of its easy solubility, to
be less fast than colouring matters containing only one sulpho acid, it is on the
contrary, although containing a disulpho-acid, faster to light and to milling than
the corresponding colours formed from mono-sulphonic acids.
In place of B-naphthylamine-gamma-disulpho-acid, other ẞ-naphthylamine- or
-naphthylamine-disulpho-acids may be employed, but hitherto we find them to
give inferior results.
Dated this 22nd day of June A.D. 1894.
WILLIAM E. HEYS,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in and connected with Yellow Colouring Matters.
We, I. LEVINSTEIN & CO. LIMITED and IVAN LEVINSTEIN, both of the
Crumpsall Vale Chemical Works, Manchester, in the County of Lancaster,
Chemical Manufacturers, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
Hitherto the substitution of natural dye-stuffs such as fustic, Persian berries, and
the like or their extracts, by coal tar colours, has not been successfully accom-
plished. It is true that some of these colours, such for example as the so-called
"alizarine yellow," and diamine yellow, have found a certain amount of technical
application, but they have never yet really replaced, to any material extent, the
natural dyes, and this fact is principally due to the difficult solution of these
colouring matters in water.

page_text: A yellow artificial colouring matter may however be produced, as hereinafter
described, which is very easily soluble in water, and which produces, on a chrome
mordant, colours which are faster than those produced by the natural dye-stuffs.
This new colouring matter is obtained by combining, in quantitative proportions.
the diazo compound of beta-naphthylamine-gamma-disulpho neid with aromatic
oxy-carbo acids, such as salicylic acid, meta-creosotic acid, and the like.
The following is given as an illustration or example of the process which we
may employ, but it will be understood that we do not limit ourselves to the
precise proportions nor to the exact process, or to the use of the particular acids
specified.
341 parts of mono-potassium salt of beta-naphthylamine-gamma-disulphonic acid
are converted in the usual manner into their diazo compounds and allowed to flow
into an aqueous solution consisting of 145 parts of salicylic acid an 81 parts of
caustic soda, whilst the solution is being stirred. After being stirred for about
three hours, the mixture is heated to about 40° C., in order to complete the
reaction. After about three more hours, the solution is boiled up, and the formed
colour is precipitated with common salt, filtered, pressed and dried.
The product is a colouring matter which is very easily soluble in water, and is
remarkable for the fact that although chemists would expect such a colour, on
account of its easy solubility, to be less fast than colours containing only one
sulpho acid, it is on the contrary, although containing a disulpho acid, faster to
the light and to milling than the corresponding colours formed from mono-sulphonie
neids.
In place of beta-naphthylamine-gamma-disulpho-acid, other beta-naphthylamine
or alpha-naphthylamine-disulpho-acids may be employed, but with generally
inferior results.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1. As a new article of manufacture, yellow artificial colouring matters produced
by the combination of the diazo compound of beta-naphthylamine-gamma- or other
beta-naphthylamine or alpha-naphthylamine disulpho acids, with aromatic carbu
acids, substantially as hereinbefore described
2. The production of yellow artificial colouring matters by the combination of
the diazo compounds of beta-naphthylamine-gamma-or other beta-naphthylamine or
alpha-naphthylamine disulpho acids with aromatic carbo neids, substantially as
hereinbefore described.
Dated this 30th day of Murch A.D. 1895.
WILLIAM E. HEYS,
Agent for the Applicants,