Improvements in Producing Azo Colours on Cotton or other Vegetable Fibre.
Year: 1889

page_text: Date of Application, 13th Dec., 1889
Complete Specification Left, 25th Aug., 1890-Accepted, 27th Sept., 1890
PROVISIONAL SPECIFICATION.
Improvements in Producing Azo Colours on Cotton or other
Vegetable Fibre.
I ROBERT HOLLIDAY of the firm of Read Holliday & Sons of Huddersfield in the
County of York, Manufacturing Chemist do hereby declare the nature of this
invention to be as follows:-
These improvements relate to producing azo colours on cotton or other vegetable
fibre and have reference to processes described in the Specifications of Letters Patent
granted respectively to Thomas. Holliday and Robert Holliday dated the 6th day of
July 1880 No. 2757, to Thomas Holliday dated the 14th day of April 1881 No. 1638,
and to Charles Holliday dated the 21st day of June 1882 No. 2946; and consist in
combining in one operation the oiling of the fibre and the impregnation of the fibre
with a phenolic body and as much fixed alkali as will develop the colour when the
fibre is afterwards passed into or impregnated with a solution of a diazo, diazoazo, or
tetrazo, compound and this is carried into effect by mixing the oil, such as is usually
employed in dyeing with alizarine, with the phenol and a fixed alkali-reducing this
mixture with water according to the quantity of phenol required to be fixed-and,
after impregnating the fibre with this mixture, drying it-when it will be ready to be
impregnated by the solution of diazo, diazoazo, or tetrazo, compounds-such com-
pounds being those which are known to produce colouring matters separately from
the fibre when combined with the phenol employed-those compounds which produce
colours the least soluble in water being the most useful.
The vegetable fibre may be in a raw state or partially or wholly manufactured.
1011
1
1001
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Producing Azo Colours on Cotton or other
Vegetable Fibre.
I ROBERT HOLLIDAY of the firm of Read Holliday & Sons of Huddersfield, in the
County of York, Manufacturing Chemist, 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:-
These improvements relate to producing azo colours on cotton or other vegetable
fibre and have reference to processes described in the Specifications of Letters Patent
granted respectively to Thomas Holliday and Robert Holliday dated the 6th day of
July 1880 No. 2757, to Thomas Holliday dated the 14th day of April 1881 No. 1638,
and to Charles Holliday dated the 21st day of June 1882 No. 2946; and consist in
combining in one operation the oiling of the fibre and the impregnation of the fibre
with a phenolic body and as much fixed alkali as will develop the colour when the
fibre is afterwards passed into or impregnated with a solution of a diazo, diazoazo, or
tetrazo, compound; and this is carried into effect by mixing the oil, such as is usually
employed in dyeing with alizarine, with the phenol and a fixed alkali-reducing this
mixture with water according to the quantity of phenol required to be fixed-and,
after impregnating the fibre with this mixture, drying it-when it will be ready to be
impregnated by the solution of diazo, diazoazo, or tetrazo, compounds-such com-
pounds being those which are known to produce colouring matters separately from
the fibre when combined with the phenol employed-those compounds which produce
colours the least soluble in water being the most useful.

page_text: The vegetable fibre may be in a raw state or partially or wholly manufactured.
As an example employing say beta napthol and the diazo compound produced from
alpha or beta napthylamine. I mix 1 lb. napthol with 1 lb. caustic soda 40° Beaume and
1 lb. say of sulphonated castor oil containing 90% of oil in 3 gallons of water warm
and when all is dissolved I pass through the solution say dry bleached calico in the
piece squeeze out at a pressure that will leave about its own weight of liquor in the
piece and dry it preferably at a low temperature I then pass it through the diazo bath
which can be prepared by diazotizing 1 lb. of napthylamine with 3 lbs. of muriatic
acid 20° B. and 2 lbs. of nitrite of soda 30° Beaume in 6 gallons of water neutralize
with powdered chalk and employ the clear liquor and the piece will be dyed a rich
red or maroon colour it can then be washed off in water and soaped in the usual manner
other phenols and other diazo, diazoazo or tetrazo compounds-other oils by pre-
ference those suitable for dyeing alizarine and other alkalis can be substituted for
those given in the example.
The proportions can be greatly varied without spoiling the result and cotton or
other vegetable fibre raw or in other stages of manufacture can be treated in a similar
manner to the example.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
Impregnation of cotton or other vegetable fibre with a solution in water of oil
(preferably such as is used in alizarine dyeing) a phenol and an alkali for the purpose
of producing an azo colour thereon.
Dated the 2nd
1000
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicant.