Improvements in the Production of Fast Colours on Fibres.
Year: 1892

page_text: Date of Application, 16th Apr., 1892
Complete Specification Left, 16th Jan., 1893-Accepted, 4th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Production of Fast Colours on Fibres.
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:-
1
This invention relates to the production on fibres of colours which are fast
against washing and soaping.
It is known that the yellow colouring-matters which are termed in commerce
"primuline," "polychromine," "thiochromogen" and the like and which result on
sulphonating the products obtained by heating paratoluidine with sulphur, can
be diazotised on fibres dyed therewith and directly combined with phenols or
amines.
Amongst the colours hitherto produced in this manner only the red dye-stuff
obtained by coupling with beta-naphthol on the fibre has been found to be of
technical value as it is sufficiently fast against fulling whilst the shades from
brownish to claret-red resulting by the employment of meta-phenylenediamine
instead of beta-naphthol are not sufficiently fast against washing. The analogous
colours obtained by employing the other known dye-stuff components such as
phenol, resorcinol, or the like also are not fast against washing and fulling.
My foreign correspondents have now found that beautiful and clear claret-red
shades of a perfect fastness against washing and soaping are obtained by combining
on the fibre the diazo derivatives of primuline, polychromine, thiochromogen or the
like with mono-alkylated beta-naphthylamines containing the alkyl group in the
amido group.
In order to illustrate the process of producing these fast colours on fibres the
following example is given.
PRODUCTION OF A FAST CLARET-RED ON FIBRES.
10 kilos of cotton are dyed whilst boiling and turning for an hour or thereabouts
in a bath prepared by dissolving 0.5 kilos of primuline in 300 liters of water and
adding 10 per cent. of sodium phosphate 2 per cent. of soap and 5 per cent. of common
salt. The material thus dyed after having been washed is first placed in a cold
solution of 0.1 kilo of sodium nitrite in 300 liters of water mixed with 0.2 kilos of
sulphuric acid at 66 degrees Baumé and is well agitated therein. After about
10 minutes the material is placed in a solution of 0-3 kilos of ethyl-beta-naphthyl-
amine-hydrochlorate in water adding a small quantity of muriatic or acetic acid.
The cotton soon assumes a beautiful claret-red colour which is absolutely fast
against washing.
The process is conducted similarly when instead of the ethyl-beta-naphthylamine
of the foregoing example analogous mono-alkyl-beta-naphthylamines containing
fatty or aromatic groups (including the benzyl group) in the amido group are
employed.
The primuline of the foregoing example may be replaced by the analogous
products obtained by treating meta-xylidine or pseudo cumidine with sulphur and
sulphonating the thio compounds so formed.
The mono-alkyl-beta-naphthylamines may also be advantageously employed for
producing on fibres fast colours from bluish-black to greenish-black and pure black
by combining with these alkyl-naphthylamines on the fibre the diazo or tetrazo
compounds of the dye-stuff's employed for the same purpose as described in the
[Price 8d.1

page_text: Specifications of Letters Patents granted to me No. 8530 dated 2nd June 1890 and
No. 9636 dated 6th June 1891.
Deted this 16th day of Anvil 1900
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
COMPLETE SPECIFICATION.
Improvements in the Production of Fast Colours on Fibres.
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 production of colours on fibres which colours
withstand washing and soaping.
It is known that the yellow colouring matters which are termed in commerce
"primuline "" "polychromine,'
,""thiochromogen" and the like and which are formed
on sulphonating the products obtained by heating paratoluidine with sulphur, can
be diazotised on fibres dyed therewith and directly combined with phenols or
amines.
Amongst the colours hitherto produced in this manner only the red dye-stuff
obtained by coupling with betanaphthol on the fibre has been found to be of
technical value as it sufficiently withstands fulling whilst the brownish to claret-red
shades resulting from the employment of meta-phenylenediamine instead of beta-
naphthol are not sufficiently fast on washing. The analogous colours obtained by
employing the other known dye-stuff components such as phenol, resorcinol, or the
like also do not withstand washing and fulling.
My foreign correspondents have now found that beautiful and clear claret-red
shades which withstand washing and soaping perfectly are obtained by combining
on the fibre the diazo derivatives of primuline, polychromine, thiochromogen or the
like with monoalkylated beta naphthylamines containing the alkyl group in the
amido group.
In order to illustrate the process of producing these fast colours on fibres the
following example is given.
· PRODUCTION OF A FAST CLARET-RED ON FIBRES.
10 kilos of cotton are dyed by boiling and turning for an hour or thereabouts in
a bath prepared by dissolving 0.5 kilo of primuline in 300 litres of water and
adding 10 per cent. of sodium phosphate, 2 per cent. of soap and 5 per cent. of common
salt. The material thus dyed having been washed is first placed in a cold solution
of 0.1 kilo of sodium nitrite in 300 litres of water mixed with 0-2 kilo of sulphuric
acid at 66 degrees Baumé and is well agitated therein. After about 10 minutes
the material is transferred into a solution of 0.3 kilo of ethylbetanaphthylamine
hydrochloride in water to which a small quantity of muriatic or acetic acid is
added. The cotton soon assumes a beautiful claret-red colour which is absolutely
fast on washing.
The process is conducted similarly when instead of the ethylbetanaphthylamine
of the foregoing example analogous monoalkly betanaphthylamines containing
fatty or aromatic groups (including the benzyl groun) in the amido group are

page_text: My foreign correspondents have further found that monoalkylbetanaphthylamines
may also be advantageously employed for producing fast colours varying from
bluish-black to greenish-black and pure-black on fabrics or fibres if these alkyl-
naphthylamines are combined on the fabric or fibre with the diazo or tetrazo
compounds of the dye-stuffs employed for dyeing on fibres as described in the
Specifications of Letters Patent granted to me No. 8530 dated 2nd June 1890 and
No. 9636 dated 6th June 1891.
The employment of monoalkylbetanaphthylamines as components (developers) in
the last named two processes (or similar processes) is effected in the manner usual in
the case of analogous components.
It is of high technical value that the shades thus produced exhibit great fastness
on washing and soaping.
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. In the production of fast shades on fibres the employment of monoalkylbeta-
naphthylamines as so called developers.
2. The process of producing fast colours on fibres which consists in dyeing cotton
or similar material with primuline, polychromine, thiochromogene or the like
placing the material thus dyed in moderately acidulated baths of sodium nitrite and
subsequently introducing the material thus treated into suitable baths of alkylbeta-
naphthylamines.
3. The process for producing fast colours on fibres which consists in dyeing
cotton or similar fibres first with the colouring matters derived from amido-
naphtholmonosulpho acid G or 18 amidonaphtholbetadisulpho acid and defined in
the Specifications of Letters Patents No. 8530 of 1890 and No. 9636 of 1891 or
with analogous dyestuffs capable of being further diazotised when fixed on fibres
introducing the dyed fibres into moderately acidulated baths of sodium nitrite and
then into suitable solutions of monoalkylbetanaphthylamine.
4. Fibres or textures dyed in the manner hereinbefore defined.
Dash: 194h da of 1902