Improvements in the Production of Cellulose Solutions Adapted for the Manufacture of Threads.
Year: 1899

page_text: Date of Application, 19th Sept., 1899
Complete Specification Left, 3rd Mar., 1900-Accepted, 21st Apr., 1900
Date of Application, 19th Sept., 1899
Complete Specification Left, 3rd Mar., 1900-Accepted, 21st Apr., 1900
Improvements in the Production of Cellulose Solutions Adapted
for the Manufacture of Threads.
I, JOHN IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in the
County of London, Consulting Engineer and Chartered Patent Agent, do hereby
declare the nature of this invention (as communicated to me from abroad by
Dr. Emile Bronnert, of Mülhausen, Niedermorschweiler, Alsatia, Chemist),
to be as follows:
By this invention the difficulty in preparing concentrated and stable solutions
of cellulose in ammoniacal copper oxide solution, suitable for the manufacture
of threads, is overcome by submitting the cellulose or cellulose derivative to the
following process before dissolving it.
'
The fat-free material is first treated with a weak bleaching liquor for a few
hours and then with a concentrated solution of caustic alkali at a low tem-
perature; after thorough washing and draining by centrifugal action the material
thus treated is dissolved in ammoniacal copper oxide solution, the best proportion
between the copper and the material being that between one molecular weight of
the cellulose or cellulose derivative and one atomic weight of copper.
Instead of treating the material first with the bleaching liquor and then with
the caustic alkali solution, the order of these operations may be reversed, in
which case thorough washing must follow the alkali treatment before the bleaching
liquor is applied.
Dated this 10th dove of Santimbar 1800
ABEL & IMRAY,
Agents for the Applicant.
Improvements in the Production of Cellulose Solutions Adapted
for the Manufacture of Threads.
I, JOHN IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in the
County of London, Consulting Engineer, and Chartered-Patent Agent, do-hereby-
declare the nature of this invention (as communicated to me from abroad by
Dr. Emile Bronnert, of Mülhausen, Niedermorschweiler, Alsatia, Chemist),
and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
By this invention the difficulty in preparing concentrated and stable solutions
of cellulose in ammoniacal copper oxide solution, suitable for the manufacture
of threads is overcome by submitting the cellulose or cellulose derivative, such
.
017

page_text: as hydrocellulose, oxycellulose, hydrate of cellulose, or mixtures of such bodies,
to the following process before dissolving it.
The fat-free material is first treated with a weak bleaching liquor, with pre-
ference electrolytical bleaching liquor in proportion of one part of cellulose to
20-30 parts of bleaching liquor for a few hours and then with a concentrated
solution of caustic alkali (about 25 per cent.) at a low temperature for about
half an hour.
After thorough washing and draining by centrifugal action the material thus
treated is dissolved in ammoniacal copper oxide solution, the best proportions
between the copper and the material being that between one molecular weight
of the cellulose (calculated for CHO) or cellulose derivative and one atomic
weight of copper.
Instead of treating the material first with the bleaching liquor and then with
the caustic alkali solution, the order of these operations may be reversed, in
which case thorough washing must follow the alkali treatment before the bleaching
liquor is applied.
Solutions prepared in this way are very convenient for spinning purposes and.
yield threads possessed of great strength, elasticity and brilliancy
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that I make
no general claim to the treatment of cellulose so as to obtain a product adapted
for spinning, but what I claim is :-
Improvements in the production of cellulose solutions adapted for the manu-
facture of threads consisting in first treating, in any order, fat free cellulose or
cellulose derivatives with a weak bleaching liquor for a few hours and with a
concentrated solution of caustic alkali at a low temperature, then washing the
material thoroughly and finally dissolving it in ammoniacal cupric solution, sub-
stantially as described.
Dated this And Anx of Haus 1000
ABEL & IMRAY,
Agents for the Applicant.