Production of Triphenylmethan Colours Dyeing with the Aid of Mordants.
Year: 1889

page_text: Date of Application, 25th Feb., 1889
Complete Specification Left, 25th Nov., 1889-Accepted, 28th Dec., 1889
PROVISIONAL SPECIFICATION.
Production of Triphenylmethan Colours Dyeing with the Aid of
Mordants.
I, THOMAS RICHARD SHILLITO of 89 Chancery Lane, in the county of Middlesex,
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by John Rudolph Geigy & Co., of Basel, Switzerland, Colour Manu-
facturers, to be as follows:-
This invention has reference to the synthesis of tricarbonic acids of aurine and its
homologues by oxidation of salicylic acid or ẞ cresotine acid (from orthocresole) and
of a methan derivative such as methylalcohol, formaldehyde, methylal, dioxy diphenyl-
methandicarbonic acid, dioxyditolylmethandicarbonic acid in a solution of sulphuric
acid with the aid of nitrous acid.
As an example of the manner of carrying out the invention, two parts salicylic
acid are dissolved in fifteen parts concentrated sulphuric acid and four parts methyl-
alcohol. This solution is heated to about 70 degrees Celsius and then one and a half
parts nitrite of sodium are added. After a short time the solution becomes of a
green metal like colour and is then poured into water by which the new product is
precipitated, then washed, saturated with an alkali and dried.
As another example, fourteen parts of dioxydiphenylmethandicarbonic acid obtained
by condensation of salicylic acid with methylal or formaldehyde, with the aid of
muriatic acid, are well mixed with seven parts of cresotine acid and gradually added
to a mixture of ninety parts of concentrated sulphuric acid with seven parts of nitrite
of sodium. The subsequent treatment is similar to that before described.
Dated this 25th day of February 1889
T. R. SHILLITO,
89, Chancery Lane, London, W.C.
COMPLETE SPECIFICATION.
Production of Triphenylmethan Colours Dyeing with the Aid of
Mordants.
I, THOMAS RICHARD SHILLITO of 89 Chancery Lane, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by John Rudolph Geigy & Co., Basel, Switzerland, Colour Manufacturers,
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
This invention has reference to the synthesis of tricarbonic acids of aurine and its
homologues by oxidation of salicylic acid or ẞ cresotine acid (from orthocresole) and
one of the following methan derivates such as methylalcohol, formaldehyde, methylal,
dioxy diphenylmethandicarbonic acid, dioxyditolylmethandicarbonic acid in a solution
of sulphuric acid with the aid of nitrous acid.
As an example of the manner of carrying out the invention, two parts of salicylic
acid are dissolved in fifteen parts of concentrated sulphuric acid and four parts of
methylalcohol. This solution is heated to about 70 degrees Celsius and then one and
a half parts of nitrite of sodium are added. After a short time the solution becomes
of a green metal like colour and is then poured into water by which the new product
is precipitated; then washed, saturated with an alkali and dried.
As another example, fourteen parts of dioxy diphenylmethandicarbonic acid obtained
by condensation of salicylic acid with methylal or formaldehyde with the aid of
muriatic acid are well mixed with seven parts of cresotine acid and gradually added

page_text: to a mixture of ninety parts of concentrated sulphuric acid with seven parts of nitrite
of sodium.
The subsequent treatment of the new product is similar to that before described.
Having now particularly described and ascertained the nature of said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
The production of colouring matters by oxidation of salicylic acid ẞ cresotine acid
with one of the following substances, that, is to say ; Methylalcohol, Formaldehyde,
Methylal, dioxy diphenylmethan dicarbonic acid, dioxy ditolylmethan dicarbonic
acid, in a solution of sulphuric acid, by means of nitrous acid, substantially as
described.
1004
T. R. SHILLITO,
89, Chancery Lane, London, W.C.
T. R. SHILLITO,
89, Chancery Lane, London, W.C.