A Method of Dyeing Half Wool with Basic Azodyestuffs in an Acid Bath.
Year: 1898

page_text: Date of Application, 9th May, 1898
Complete Specification Loft 9th Fab. 1900 Mecantad
44th M
1000
Date of Application, 9th May, 1898
Complete Specification Loft, 8th Fob 4800
Accepted, 441
44th Mar., 1000
PROVISIONAL SPECIFICATION.
A Method of Dyeing Half Wool with Basic Azodyestuffs in an
Acid Bath.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare the
nature of this invention (as communicated to me from abroad by The Farbwerke
vormals: Meister Lucius and Brüning, of Hoechst a/Main, in the Empire of
Germany, Chemical Manufacturers,) to be as follows:-
In the Specification No. 5119 of 1897 is described a method of dyeing half wool
in an acid bath with strong basic azodyestuffs, whereby the wool and the cotton in
half woollen spun goods and woven fabrics are dyed to equal strength.
This process is based upon the marked relationship of these dyestuffs to vegetable
fibre which has the same effect even in the presence of woollen fibre.
My foreign correspondents have further found that new effects may be obtained
with the said azodyestuffs, of which the most important are known commercially
as "Janus" colours.
If organic acids, especially acetic, lactic, tartaric, ethyl-tartaric, oxalic acids and
the like be used in preparing the bath, without any addition of salt (Glaube: or
common salt), the affinity of these dyestuffs to the cotton fibre is so pre-eminent,
that the cotton is powerfully dyed; whilst the wool, especially if the temperature
of the bath be kept below boiling point, absorbs little or no dyestuff.
If in this bath acid dyestuffs be used simultaneously, then equal, corresponding
uniform or contrasting shot shades of the cotton and wool are obtained, according
as the tints of the "Janus" and the acid dyestuffs employed are chosen for
conformity or for great variation.
With this method of working the dyeing of cotton is obtained exclusively
with the Janus colours and that of wool for the greater part only with acid
dyestuffs.
The method is illustrated by the following examples:-
,
I. SHOT-GREEN-RED UPON 2 PIECES = 20 KIL. HALF WOOLLEN Goods.
The bath is prepared with about 600 litres of water, as much oxalic acid as is
requisite for neutralising the carbonates and 2 kil. of acetic acid, 100 grammes
patent blue V and 60 gr. naphthol yellow S. The previously well wetted and
correspondingly prepared goods are introduced at 60° C., brought to boil and
kept at this temperature from 3 to 1 hour, the steam is then cut off, the bath is
allowed to cool down to 70° C., then 100 grammes of carefully dissolved Janus-
red B are added and the dyeing is completed at 70° C. in about 1 hour. In
again using the bath for a further lot, only 10% of acetic acid is at first introduced
and by dyeing for ½ of an hour at 70° C., the Janus-red still in the bath is
exhausted, whereupon the acid dyes are added and the operation is carried out as
in the case of the fresh bath above mentioned.
II. UNIFORM-BLUE UPON 2 PIECES 20 KIL. HALF WOOLLEN GOODS.
=

page_text: requisite for neutralizing the carbonates of the water and 2 kilos. of acetic acid,
140 grammes of Victoria violet 4 B.S. and 60 grammes of patent-blue. The
goods previously well wetted and correspondingly prepared are introduced at 60° C.,
brought to boil and kept at this temperature from 3 to 1 hour the steam is then
cut off, the bath is allowed to cool down to 70° C., then 200 grammes of
Janus-blue Rand 200 grammes of Janus-gray B carefully dissolved are added
and the dyeing is completed at 70° C. in about 1 hour. The goods are slightly
rinsed and subsequently treated in the cold on a jigger or padding machine
with 400 grammes of tannin, 400 grammes of sulphuric acid, and 200 grammes
of tartar emetic.
.
The further treatment of the bath is the same as stated in Example I.
Instead of adding the dyestuff's successively to the bath as described in the
examples, they may also be added at once, especially in the case of light colours.
Dated this 9th day of May 1898
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
A Method of Dyeing Half Wool with Basic Azodyestuffs in an Acid
Bath.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, Chancery
Lane, in the County of London, Chartered Patent Agent, do hereby declare the
nature of this invention (as communicated to me from abroad by The Farbwerke
vormals: Meister Lucius and Brüning, of Hoechst a/Main, in the Empire of
Germany, Chemical Manufacturers,) and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:
In the Specification No. 5119 of 1897 is described a method of dyeing half wool
in an acid bath with strong basic azodyestuffs, whereby the wool and the cotton in
half woollen spun goods and woven fabrics are dyed to equal strength.
This process is based upon the marked affinity of these dyestuffs for vegetable
fibre even in the presence of woollen fibre.
My foreign correspondents have further found that new effects may be obtained
with the said azo-dyestuffs, of which the most important are known commercially
as "Janus" colours.
If organic acids, especially acetic, lactic, tartaric, ethyl-tartaric, oxalic acids and
the like be used in preparing the bath, without any addition of salt (Glauber or
common salt), the affinity of these dyestuffs to the cotton fibre is so pre-eminent,
that the cotton is powerfully dyed; whilst the wool, especially if the temperature
of the bath be kept below boiling point, absorbs little or no dyestuff.
If in this bath acid dyestuffs be used simultaneously, then equal, corresponding
uniform or contrasting shot shades of the cotton and wool are obtained, according
as the tints of the Janus" and the acid dyestuffs employed are chosen for
conformity or for great variation.
With this method of working the dyeing of cotton is obtained exclusively
with the Janus colours and that of wool for the greater part only with acid
dyestuffs.
The method is illustrated by the following examples:-
I. SHOT-GREEN-RED UPON 2 PIECES 20 KILOS. HALF WOOLLEN GOODS.
=
The bath is prepared with about 600 litres of water, as much oxalic acid as is
requisite for neutralising the carbonates therein and 2 kilos. of acetic acid,

page_text: 100 grammes patent blue V and 60 grammes naphthol yellow S The previously well
wetted and suitably prepared goods are introduced at 60° C., brought to boil and
kept at this temperature from 4 to 1 hour, the steam is then cut off, the bath is
allowed to cool down to 70° C., then 100 grammes of carefully dissolved Janus-
red B are added and the dyeing is completed at 70° C. in about 1 hour. In
again using the bath for a further lot, only 10 per cent. of acetic acid is at first intro-
duced and by dyeing for 1 of an hour at 70° C., the Janus red still in the bath is
exhausted, whereupon the acid dyes are added and the operation is carried out as
in the case of the fresh bath above mentioned.
II. UNIFORM-BLUE UPON 2 PIECES 20 KILOS. HALF WOOLLEN GOODS.
The bath is prepared with about 600 litres of water, as much oxalic acid as is
requisite for neutralising the carbonates of the water and 2 kilos. of acetic acid,
140 grammes of Victoria violet 4 B.S. and 60 grammes of patent blue. The
goods previously well wetted and suitably prepared are introduced at 60° C.,
brought to boil and kept at this temperature from 3 to 1 hour the steam is then
cut off, the bath is allowed to cool down to 70° C., then 200 grammes of
Janus blue R and 200 grammes of Janus-gray B carefully dissolved are added
and the dyeing is completed at 70° C. in about 1 hour. The goods are slightly
rinsed and subsequently treated in the cold on a jigger or padding machine
with 400 grammes of tannin, 400 grammes of sulphuric acid, and 200 grammes
of tartar emetic.
The further treatment of the bath is the same as stated in Example I.
Instead of adding the dyestuff's successively to the bath as described in the
examples, they may also be added at once, especially in the case of light colours.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
1 claim is:
The herein described method of dyeing half-wool in an acid bath with safranine
azo dyestuffs or such basic poly azo dyestuffs having as component an aromatic
ammonium base or amidobenzylamine or its derivative, characterized by carrying
out the dyeing with an organic acid in exclusion of salts by a simultaneous
application of acid dyestuffs.
Dated this 8th day of Kobruo 1800
ABEL & IMRAY,
Agents for the Applicant.