A Process for Dyeing with Yellow, Orange, and Red Azoic Coloring Matters.
Year: 1889

page_text: Date of Application, 4th Jan., 1889
Complete Specification Left. 7th Sept., 1889-Accepted, 26th Oct., 1889
PROVISIONAL SPECIFICATION.
[Communicated from abroad by LA SOCIÉTÉ ANONYME DES MATIÈRES COLORANTES
ET PRODUITS CHIMIQUES DE ST. DENIS, of 105, Rue Lafayette, Paris, France.]
A Process for Dyeing with Yellow, Orange, and Red Azoic Coloring
Matters.
I, JOHN IMRAY of No. 28 Southampton Buildings Chancery Lane in the County of
Middlesex, Consulting Engineer and Patent Agent do hereby declare the nature of
this invention to be as follows:-
The colouring matters described in the Specifications to Patents No. 9315 and
No. 11,976 of 1887 were there stated to dye non-mordanted cotton in an alkaline
bath.
The present invention relates to a process of dyeing which has been found to give
the best results. This process is especially applicable to phenolic coloring matters,
that is to say those derived from phenole, resorcine, naphthole, and their sulphonic and
carboxylic acids. These matters are first dissolved in water rendered strongly alkaline
by an excess of caustic soda. The addition of soda has the effect of forming very
basic salts, which, whilst they are more soluble in water than the neutral salts, are
more actively absorbed by the textile fibre under the conditions which will now be
described. In such a solution the non-mordanted cotton would not become dyed with
fast colours except in presence of great excess of the coloring matters. But, by
adding sodium chloride to the aqueous solution up to the moment when the colouring
matter is precipitated at low temperature, a medium is obtained in which, when heated,
cotton becomes perfectly dyed until the bath is almost exhausted. For the sodium
chloride may be substituted other salts which have the property of displacing the
colouring matter, such for instance as sulphate of soda, but on account of its solubility
and cheapness sodium chloride is to be preferred.
When the dyeing is effected there remains on the fibre a very basic salt of soda,
which would be partly removed by the water if rinsing were at once proceeded with.
Before rinsing, the dyed cotton is passed through acidulated water which fixes the
colouring matter. By the process above described, without preliminary mordanting,
dyes are obtained much richer, faster and cheaper than when the same colouring
matters are applied by the ordinary dyeing processes. As an example may be described
the process for dyeing with the red colouring matter obtained by combining the
diazoic derivate of an azoxytoluidine with one of the sulpho-naphthols.
For dyeing 100 kilos of cotton-to 2 kilos of the colouring matter and 6 litres of
caustic soda lye at 40° Be are added 100 litres of water. Also the dyeing bath is
prepared by mixing 1600 litres of sodium chloride solution at 20° B and 20 litres
of caustic soda lye at 40° Be, and this mixture either by blowing in steam for heating,
or by adding water is increased to a volume of 2000 litres. Into this bath are intro-
duced the 100 kilos of cotton and the mixture of colouring matter above described.
The dyeing occupies about half an hour. When the cotton is taken out, it is passed
through hot acidulated water and then rinsed. The dyeing bath is rendered fit for a
second operation by adding to it a little more than balf, about ths of the same
mixture of colouring matter, soda and water, as before. The bath being thus brought
to a density of 17° to 18° Be cold or 15° Be hot, a second quantity of 100 kilos of
cotton can be dyed; and thus, by keeping up the required density of the liquor,
dyeing can be carried on indefinitely, it being understood that by each dyeing opera-
tion the cotton takes up the quantity of colouring matter and caustic soda previously
added.
T11: 0:1 .
T
1000
ABEL & IMRAY,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
A Process for Dyeing with Yellow, Orange, and Red Azoic Colouring
Matters.
I, JOHN IMRAY, of No. 28 Southampton Buildings, Chancery Lane, in the County of
Middlesex, Consulting Engineer and Patent Agent, 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 :-
I
The colouring matters described in the Specifications to Patents No. 9315 and
No. 11976 of 1887 were there stated to dye non-mordanted cotton in an alkaline
bath.
The present invention relates to a process of dyeing which has been found to give
the best results. This process is especially applicable to phenolic coloring matters,
'that is to say thoso 'derived from plienole, resorcine, naphthole," and their sulphonic
cand carboxylic acids. These' matters are first dissolved in water rendered strongly
alkaline by an excess of caustic soda. The addition of soda has the effect of forming
very basic salts, which, whilst they are more soluble in water than the neutral salts,
are more actively absorbed by the textile 'fibre 'under the conditions which will now be
described. In such a solution the non mordanted cotton 'would not become dyed with,
"fast colours except in presence of great excess of the coloring matters. But,' by
adding sodium chloride to the aqueous solution up to the moment when the colouring
matter is precipitated at low temperature, 'a'medium is obtained in which, when
heated, cotton becomes perfectly dyed until the bath is almost exhausted. For the
"sodium chloride may be substituted other salts which have 'the property of displacing
the colouring matter, such for instance as sulphate of soda, but, on account of 'its
solubility and cheapness, sodium chloride is to be preferred.
.
When the dyeing is effected, there remains on the fibre a very basic salt of soda,
which would be partly removed by the water if rinsing were at once proceeded with.
Before rinsing the dyed cotton is passed through acidulated water which fixes the
colouring matter. By the process above described, without preliminary mordanting,
dyes are obtained much richer, faster and cheaper than when 'the same colouring
matters are applied by the ordinary' dyeing processes. As an example may be described
the process for dyeing with the red colouring matter obtained by combining the diazoic
derivate of an azoxytoluidine with one of the sulpho naphthols.
3
For dyeing 100 kilos of 'cotton, to 2 kilos of the colouring matter and 6 litres of
caustic soda lye at 40° B. are added 100 litres of water. Also the dyeing bath is
prepared by mixing 1600 litres of sodium chloride solution at 20° B. and 20 litres of
caustic soda lye at 40° B, and this mixture 'either by blowing in steam for heating or
by adding water is increased to a volume of 2000 litres. Into 'this' bath are intro-
duced the 100 kilos of cotton and the mixture of colouring matter above described.
The dyeing 'occupies about half an hour. When the cotton is taken out, it is passed
through hot acidulated water and then rinsed. The dyeing bath is rendered fit for a
second operation by adding to it' a little more than half, about #ths of 'the saine
mixture of colouring matter; soda and water, as before. "The bath being thus brought
to a density of 17° to 18° B. 'cold, or 15° B! hot, a second quantity of 100 kilos of
cotton can be dyed; and thus by keeping up the required density of the liquor,' dyeing
can be carried on indefinitely, it being understood that by each dyeing operation the
cotton takes up the quantity of colouring matter and caustic soda previously added.
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
7"
S
The herein described process of dyeing with azoic colouring matters in strongly
alkaline solution with addition of sodium chloride or its equivalent.
ABEL & IMRAY,
Agents for the Applicant.