Production of Yellow Basic Colouring Matter.
Year: 1890

page_text: Date of Application, 3rd Feb., 1890
Complete Specification Left, 17th Oct., 1890-Accepted, 22nd Nov., 1890
PROVISIONAL STECIFICATION.
[Communicated from abroad by THE SOCIETY OF CHEMICAL INDUSTRY IN BASLE,
of Basle, Switzerland, Chemical Manufacturers.]
Production of Yellow Basic Colouring Matter.
I, OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane, in the County
of London, Fellow of the Institute of Patent Agents, do hereby declare the nature
of this invention to be as follows:-
This invention relates to the production of a basic coloring matter obtained from
meta-toluylendiamine, useful for dyeing and printing silk and cotton yellow.
The communicators of this invention have found that by melting meta-toluylen-
diamine with oxalic acid and a condensation agent such as chloride of zinc, a coloring
base of a yellow dye is formed.
By dissolving the molten mass with diluted muriatic acid the coloring matter,
viz.: its hydrochlorate, is directly obtained.
OVISIONAL DIMOIFICATION.
[Communicated from abroad by THE SOCIETY OF CHEMICAL INDUSTRY IN BASLE,
of Basle, Switzerland, Chemical Manufacturers.]
Production of Yellow Basic Colouring Matter.
I, OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane, in the County
of London, Fellow of the Institute of Patent Agents, do hereby declare the nature
of this invention to be as follows :-
This invention relates to the production of a basic coloring matter obtained from
meta-toluylendiamine, useful for dyeing and printing silk and cotton yellow.
The communicators of this invention have found that by melting meta-toluylen-
diamine with oxalic acid and a condensation agent such as chloride of zinc, a coloring
base of a yellow dye is formed.
By dissolving the molten mass with diluted muriatic acid the coloring matter,
viz. its hydrochlorate, is directly obtained.
EXAMPLE:
23 kilograms of meta-toluylendiamine,
دو
2.3
1.5
"
"
1.8
"
27
oxalic acid, well dried,
glycerine,
chloride of zinc,
are heated together under constant agitation to about 120° to 130° C. in an enamelled
vessel.
When the energetic development of carbonic acid ceases, the temperature is
raised to about 150° to 160° C. and maintained at this point for 3 or 4 hours.
The molten mass being then dissolved in 16 kilos. of muriatic acid of 25%, and
diluted with 8 litres of water, the coloring matter separates out.
It is filtered and the precipitate is washed in warm water. For purification, it is
dissolved in boiling water and precipitated with salt.
The dried coloring matter is a yellow powder which dyes silk yellow with greenish
fluorescence; cotton mordanted with tannin is dyed by it a bright yellow.
Dated this 3rd day of February 1890.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Production of Yellow Basic Colouring Matter.
I OLIVER IMRAY of No. 28 Southampton Buildings, Chancery Lane in the County
of London, Fellow of the Institute of Patent Agents, 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 :-
This invention relates to the production of a basic colouring matter obtained from
meta-toluylendiamine, useful for dyeing aud printing silk and cotton yellow.
The communicators of this invention have found that by melting meta-toluylen-
diamine with oxalic acid and a condensation agent such as chloride of zinc, a colouring
base of a yellow die is formed.
By dissolving the molten mass with diluted muriatic acid the colouring matter,
viz. its hydrochlorate is directly obtained.

page_text: 2.3
"
"
1.5
"
"
1.8
"2
"
oxalic acid, well dried,
glycerine,
chloride of zinc,
are heated together under constant agitation to about 120° to 130° C. in an enamelled
vessel. When the energetic development of carbonic acid ceases, the temperature is
raised to about 150° to 160° C. and maintained at this point for 3 or 4 hours.
The molten mass being then dissolved in 16 kilos. of muriatic acid of 25%, and
diluted with 8 litres of water, the colouring matter separates out. It is filtered and
the precipitate is washed in warm water. For purification, it is dissolved in boiling
water and precipitated with salt.
The dried colouring matter is a yellow powder which dyes silk yellow with greenish
fluorescence; cotton mordanted with tannin is dyed by it a bright yellow.
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 manufacture of a yellow colouring matter from meta-toluylendiamine by
the action of oxalic acid and a condensation agent such as chloride of zinc.
2. The colouring matter produced in the manner referred to in the preceding
claim.
of than 1000
ABEL & IMRAY,
Agents for the Applicant.