Improvements in the Manufacture of Colouring Matters.
Year: 1899

page_text: Date of Application, 8th Aug., 1899
1000
1000
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Colouring Matters.
We, READ HOLLIDAY & SONS LIMITED, of Huddersfield, in the County of York,
Manufacturing Chemists, and JOSEPH TURNER, HARRY DEAN, and JAMES TURNER,
Chemists, of the same place, do hereby declare the nature of this invention
to be as follows:-
The present invention relates to the production of dyestuffs which dye vege-
table fibre various shades of brown.
We have found that valuable dyestuffs are obtained, by heating in a suitable
vessel, certain aromatic substances containing the group CH, along with nitro,
or amido groups, or both, and one or more sulpho groups, with sodium sulphide
and sulphur, or with caustic alkalies and sulphur.
EXAMPLE 1.
20 parts of ortho toluidine para sulphonic acid are heated in an iron pan with
50 parts of caustic soda 40° Beamé and 10 parts of sulphur. During several
hours the temperature is gradually raised to from 250 degrees Centigrade to
300 degrees Centigrade and maintained at this temperature for about one hour.
If in this example the ortho toluidine para sulphonic acid be replaced by the
ortho toluidine meta sulphonic acid, or the sulphonic acids of xylidine or para
toluidine, similar dyestuffs are obtained.
EXAMPLE 2.
100 parts of para nitro toluol sulphonic acid are heated with 400 parts
crystallized sodium sulphide and 50 parts of sulphur.
After all the water is driven off, the mass is raised to 300 degrees Centigrade
and maintained at this temperature until no increase in depth of colour can be
observed.
In a similar manner we obtain dyestuffs of a brown shade, by employing the
sulphonic acids of ortho nitro toluol or nitro xylol in place of the para nitro
toluol sulphonic acid in this example.
EXAMPLE 3.
100 parts of meta toluylene diamine sulphonic acid are heated with 300 parts
of caustic soda 40° Beaumé, and 50 parts sulphur, to a temperature of from 250
to 280 degrees Centigrade for 2 to 3 hours. The product so obtained may be used
direct for dyeing.
EXAMPLE 4.
100 parts of sulpho benzene azo meta toluylene diamine are heated with 300
parts caustic soda 40° Beaumé, and 50 parts sulphur, to a temperature of 280
degrees Centigrade for a few hours. The product dyes vegetable fibres brown.
In a similar manner we may use the azo bodies, produced by combining the
diazo compounds from the sulpho acids of aniline, foluidine, xylidine, or meta
toluylene diamine upon meta toluylene diamine, with good results.

page_text: In lieu of caustic soda and sulphur, we may use sodium sulphide or any poly-
sulphides of the alkalies and the proportions of the different constituents may
be varied within wide limits.
Dated 1 01.
1000
Improvements in the Manufacture of Colouring Matters.
We, READ HOLLIDAY & SONS LIMITED, of Huddersfield, in the County of York,
Manufacturing Chemists, and JOSEPH TURNER, HARRY DEAN, and JAMES TURNER,
Chemists, of the same place, 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:―
The present invention relates to the production of dyestuffs which dye vege-
table fibre various shades of brown.
We have found that valuable dyestuffs are obtained by heating in a suitable
vessel certain aromatic substances containing the group CH, along with nitro,
or amido groups, or both and one or more sulpho groups, with sodium sulphide
and sulphur or with caustic alkalies and sulphur.
EXAMPLE I.
20 parts of ortho toluidine para sulphonic acid are heated in an iron pan with
50 parts caustic soda 40° Beaumé, and 10 parts of sulphur. During several
hours the temperature is gradually raised to from. 250° C to 300° C and main-
tained at this temperature for about 1 hour. If, in this example, the ortho
toluidine para sulphonic acid be replaced by the ortho toluidine meta sulphonic 2
acid, or the sulphonic acid of xylidine or para toluidine similar dyestuffs are
obtained.
EXAMPLE II.
100 parts of para nitro toluol sulphonic acid are heated with 400 parts of
crystallized sodium sulphide and 50 parts of sulphur. After all the water is 3
driven off, the mass is raised to 300° C and maintained at this temperature until
no increase in depth of colour can be observed. In a similar manner we obtain
dyestuffs of a brown shade, by employing the sulphonic acids of ortho nitro
toluol or nitro xylol in place of the para nitro toluol sulphonic acid in this
example.
EXAMPLE III
100 parts of meta toluylene diamine sulphonic acid are heated with 300 parts
of caustic soda 40° Beaumé and 50 parts sulphur, to a temperature of from 250° C
to 280° C for 2 to 3 hours. The product so obtained may be used direct for
dvoine
BEANIELLE
100 parts of sulpho benzene azo meta toluylène diamine are heated with 300
parts of caustic soda 40° Beaumé, and 50 parts sulphur to a temperature of 280° C
for a few hours. The product dyes vegetable fibres brown. In a similar manner
we may use the azo bodies, produced by combining the diazo compounds from
4

page_text: the sulpho acids of aniline, toluidine, xylidine, or meta toluylene diamine upon
meta toluylene diamine, with good results.
In lieu of caustic soda and sulphur, we may use sodium sulphide or any poly
sulphides of the alkalies and the proportions of the different constituents may be
varied within wide limits.
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 dyestuffs by heating the hereinbefore mentioned aromatic
compounds containing one or more CH, groups, along with nitro or amido groups
and one or more sulpho groups with caustic alkali and sulphur, or sodium sul-
phide and sulphur as herein before described.
2. The dyestuffs as herein before described and claimed in the preceeding
claim.
OOCT PTY TO CRD
WM. BROOKES & SON,
55/56, Chancery Lane, London, Agents for the Applicants.