Improvements in the Production of Colouring Matters Containing Sulphur.
Year: 1899

page_text: Date of Application, 17th Nov., 1899
Complete Specification Left, 17th Aug., 1900--Accepted, 22nd Sept., 1900
PROVISIONAL SPECIFICATION.
Improvements in the Production of Colouring Matters Containing
Sulphur.
We, READ HOLLIDAY AND SONS, LIMITED, Chemical Manufacturers of Hudders-
field, JOSEPH TURNER, of Spinkfield Road, Birkby, Huddersfield, HARRY DEAN,
of Greenhead Road, Huddersfield, and JAMES TURNER, of Spinkfield Road,
Birkby, Huddersfield aforesaid, Chemists, do hereby declare the nature of this
invention to be as follows:-
When para amido phenol is heated with sulphur without the presence of
caustic alkalies or alkali sulphides, blue dyestuffs are obtained which vary in
shade and properties according to the proportion of sulphur used.
We have now found that by heating para amido phenol with sulphur in the
presence of aromatic amines new colouring matters result which are suitable for
dyeing vegetable fibres.
EXAMPLE, I.
107 parts para toluidine
109
128
وو
"
para amido phenol
sulphur
are heated in a vessel provided with a reflux condenser for a few hours to 180° C.
and the temperature raised finally to 210° C. and maintained at this for 2
or 3 hours. When cool the melt is treated with dilute hydrochloric acid to
extract traces of free para toluidine.
The residue after extraction is soluble in caustic alkalies or alkaline sulphides
with a greenish blue colour and may be used direct for dyeing.
EXAMPLE II.
93 parts aniline oil
"
109
64
"
para amido phenol
sulphur
are heated in a vessel provided with a reflux condenser for a few hours to 180° C.
and we then further raise the temperature to about 200° C. for 2 or 3 hours.
The melt is then purified as in the preceding example.
If in the above examples we replace the para toluidine or aniline by the
corresponding molecular proportion of ortho toluidine or xylidine, dyestuffs
result which have similar properties.
EXAMPLE III.
109 parts para amido phenol
320
"
dehydrothio-p-toluidine sulphonic acid.

page_text: The fastness to light and milling of the shades produced by these dyestuffs
may be considerably increased by a subsequent treatment with oxidising agents.
Dated the 17th day of November 1900
WM. BROOKES & SON,
55/56, Chancery Lane, London,
Agents for the Applicants.
Improvements in the Production of Colouring Matters Containing
Sulphur.
We, READ HOLLIDAY AND SONS, LIMITED, Chemical Manufacturers of Hudders-
field, JOSEPH TURNER, Spinkfield Road, Birkby, Huddersfield, HARRY DEAN,
Greenhead Road, Huddersfield, and JAMES TURNER, Spinkfield Road, Hudders-
field aforesaid, Chemists, 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:-
When para amido phenol is heated with sulphur without the presence of
caustic alkalies, or alkali sulphides, blue dyestutis are obtained which vary in
shade and properties according to the proportion of sulphur used.
We have now found that by heating para amido phenol with sulphur in the
presence of aromatic amines new colouring matters result which are suitable for
dyeing vegetable fibres.

page_text: The fastness to light and milling of the shades produced by these dyestuffs
may be considerably increased by a subsequent treatment with oxidising agents.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is:-
1. The production of colouring matters by heating together molecular propor-
tions of para toluidine, para amido phenol and sulphur, as hereinbefore described.
2. The production of colouring matters by heating together molecular propor-
tions of aniline, para amido phenol and sulphur, as herein before described.
3. The production of colouring matters by heating together dehydrothiopara-
toluidine sulphonic acid, and para amido phenol in molecular proportions, as
hereinbefore described.
4. The production of colouring matters by heating together para amido phenol,
sulphur and aromatic amines in molecular proportions, which dye vegetable fibres
slate to black.
1
1000
WM. BROOKES & SON,
55 & 56 Chancery Lane, London,
-
Agents for the Applicants.