in and connected with the Manufacture and Production of Direct-dyeing Colouring Matters for Dyeing and Printing.
Year: 1889

page_text: Date of Application, 19th Nov., 1889
Complete Specification Left, 19th Aug., 1890-Accepted, 4th Oct., 1890
Improvements
PROVISIONAL SPECIFICATION.
in and connected with the Manufacture and
Production of Direct-dyeing Colouring Matters for Dyeing and
Printing.
I BENJAMIN WILLCOX of 47 Lincoln's Inn Fields in the County of Middlesex 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:-
This invention relates to the manufacture of mixed colouring matters by the
employment of cresol carbon acids as hereinafter described.
It is known that salicylic acid when acting upon one molecule of a tetrazo com-
pound combines in the first place with one molecule to form an intermediate product
which product containing yet another free diazo group is enabled to combine with
other dyestuff components to form mixed colouring matters of considerable value.
The present invention consists in the production of colouring matters derived from
ortho or meta cresol carbon acids (the next higher homologue of salicylic acid) acted
on by tetrazo diphenyl chloride or tetrazo ditolyl chloride as hereinafter explained.
In order to obtain the heretofore unknown intermediate products formed by tetrazo-
diphenyl and tetrazo ortho ditolyl with one molecule of ortho or meta cresol carbon
acid, the molecular proportions or quantities are caused to react upon one another in an
acetic acid solution and are then rendered slightly alkaline with soda. The intermediate
products are immediately formed. These products are then allowed to run into an
acetic acid solution of any amine or of a sulpho or carbon acid of an amine or into the
alkaline solution of a phenol or of a sulpho or carbon acid of a phenol.
The following are given as examples of the manufacture first, of the intermediate
product and afterwards of the direct dyeing tetrazo colouring matters suitable for
either dyeing or printing obtained by means of this invention.
MANUFACTURE OF THE INTERMEDIATE PRODUCT OF TETRAZO DIPHENYL + ONE
MOLECULE OF META CRESOL CARBON ACID.
About 20 kilos. of benzidine sulphate are diazotised in the usual way and the clear
filtered solution of the tetrazo diphenyl chloride thus obtained is caused to run into a
weak acetic acid solution of kilos. of meta cresol carbon acid. This being rendered
slightly alkaline with soda a change of colour takes place accompanied by the
formation of the required intermediate product. The latter is formed after standing
for some time. The same result is obtained with the employment of an equivalent
quantity of tolidine sulphate.
For example:-Colouring matter obtained with one molecule of benzidine + one
molecule of meta cresol carbon acid + one molecule of beta naphthylamine
disulpho acid R.
The intermediate product obtained as hereinbefore described is caused to run into
an acetic acid solution of 15 kilos. of beta naphthylamine disulpho acid R and in the
first place is allowed to stand for say about 12 hours to form the colouring matter. It
is then heated to about 80 degrees Centigrade and rendered alkaline with soda lye.
The colouring matter obtained is salted out and separated in the usual way. It dyes
a yellowish red colour.
Second example:-Colouring matter obtained with tolidine + one molecule of
meta cresol carbon acid + one molecule of beta naphthol disulpho acid R.
By causing the intermediate product herein before described of one molecule of
tetrazo diphenyl chloride + one molecule of meta cresol carbon acid to run into a
Price 6d1

page_text: solution, maintained alkaline by soda, of 15 kilos. of beta naphthol disulpho acid R, a
-beautiful brownish red dye is obtained.
The following dyestuff components may likewise be employed with good effect in
place of the aforesaid amines and phenols namely,
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in and connected with the Manufacture and
Production of Direct-dyeing Colouring Matters for Dyeing and
Printing.
I BENJAMIN WILLCOX of 47 Lincoln's Inn. Fields in the County of Middlesex Patent
Agent do hereby declare the nature of this invention which has been communicated
to me from abroad by 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 :-
This invention relates to the manufacture of mixed colouring matters by the
employment of cresol-carboxy-acids as hereinafter described.
It is known that when salicylic acid acts upon a tetrazo compound it combines in
the first place with one molecular proportion to form an intermediate product which
product contains a free diazo group and is therefore enabled to combine with other dye
stuff components to form mixed colouring matters of considerable value.
The present invention consists in the production of colouring matters derived from
ortho- or meta-cresol-carboxy-acids (the next higher homologue of salicylic acid) and
tetrazo-diphenyl-chloride or tetrazo-ditolyl-chloride as hereinafter explained.
In order to obtain the intermediate products formed from tetrazo-diphenyl or
tetrazo-ortho-ditolyl and one molecular proportion of ortho- or meta-cresol-carboxy-
acid, the molecular proportions or quantities are caused to react upon one another in
an acetic acid solution and the solution is then rendered slightly alkaline with soda.
The intermediate products are immediately formed. These products are then allowed
to run into an acetic acid solution of any amine or of a sulpho- or carboxy-acid of an
amine or into the alkaline solution of a phenol or of a sulpho or carboxy-acid of a
phenol.
The following are given as examples of the manufacture of the new direct dyeing
tetrazo colouring matters, suitable for either dyeing or printing, obtained by means of
this invention.
MANUFACTURE OF THE INTERMEDIATE PRODUCT OF TETRAZO-DIPHENYL + ONE
MOLECULAR PROPORTION OF META-CRESOL-CARBOXY-ACID.

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
―
1. The manufacture of mixed colouring matters by combining tetrazo-dipheny!-
or ortho-tetrazo-ditolyl salts with one molecular proportion of ortho- or meta-cresol-
carboxy-acid so as to form an intermediate product and reacting with this product
on phenols, amines, or their sulpho- or carboxy-acids.
2. As new articles of manufacture the products hereinbefore described.
J. H. JOHNSON & Co.,
Agents.