Year: 1894

page_text: Date of Application, 23rd June, 1894-Accepted, 28th July, 1894

page_text: EXAMPLE.
107 parts of a solution containing 28 per cent. of methyl-benzylaniline sulphonate
of soda are acidulated with 21 parts of hydrochloric acid of 21° Bé. and, after
cooling, 7 parts of sodium nitrite in a concentrated solution are added to this
mixture.
The mass is left to stand for 12 hours.
In order to effect the conversion into the thio sulpho acid, 35 parts of acetic acid
containing 40 per cent. of pure acid and a solution of 50 parts of sodium thiosulphate
are added, and the temperature is raised to from 80° to 100° C. until the nitroso
compound has disappeared entirely.
To this sulpho acid of paraamido methyl benzyl aniline mono-sulpho acid thus
produced a concentrated solution of 30 parts of 7 oxy 1. 2. naphthoquinone 4 mono-
sulphonate of potassium is added and the mass is heated for 2 to 3 hours. From
the dark colored liquid the new dyestuff' separates out as a green crystalline powder
of metallic lustre. It is washed in cold water and dried.
The new coloring matter forms a dark violet powder which dissolves with a blue
violet color in concentrated sulphuric acid, changing to brown and blue upon
addition of water, with separation of blue violet flakes."
In a dilute ammonia solution the new dye stuff dissolves with a blue violet
colour.
Dyed in the acid bath on wool mordanted with chromium salts, the new product
gives very bright and pure blue tints of great fastness to light and washing.
The tints obtained on unmordanted wool are of a bright violet but are deficient
in fastness to light.
If in the above example for oxy 1. 2. naphtho-quinone 4 mono sulphonate of
potassium are substituted 6 oxy 1. 2. nnphihoquinone 4 mono sulphonate of
potassium, a green crystalline powder is obtained. It dissolves in sulphuric acid
with a brown colour and, on dilution with water, it gradually turns to yellow-green,
then to blue with separation of flakes.
In ammonia it dissolves with a green colour.
The tints on wool mordanted with chromium salts are blue violet.
If in the above mentioned example, for thio-sulpho acid of para-amido-methyl-
benzyl aniline mono-sulpho acid, the thio-sulpho acid of para amido ethyl benzyl
aniline mono sulpho acid be substituted, colouring matters are obtained which also
dye blue tints on wool mordanted with chrome, but of a greener shade.
If this sulpho neid of pam-amido-inouo-benzyl ortho-toluidine mono-sulpho acid
he employed instead of the before mentioned thio-sulpho acids, new poly oxy-
thionine dyestuff's are produced which yield considerably redder tints.
All the colouring matters, herein before defined, are suitable for dyeing and
printing wool mordanted with metallic salts (especially chromium) with tints
very fast against the action of light and fulling.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is:-
:-
1. The manufacture of poly-oxy-thionine colouring matters dyeing on mordants,
by allowing the thio sulpho acids of para-amido methyl benzyl-aniline sulpho acid,
para-amido ethyl benzyl aniline sulpho acid, para-mido benzyl ortho toluidine
sulpho acid, to act on the salts of 7. oxy 1. 2. naphthoquinone 4 sulpho acid or ou
6. oxy 1. 2. naphthoquinone 4 sulpho acid, substantially as described.
2. The new coloring matters obtained by the process above referred to.
Dated this 23rd day of June 1894.
ABEL & IMRAY,
Agents for the Applicant.
ABEL & IMRAY,
Agents for the Applicant.