An Improvement in the Manufacture of Viscose.
Year: 1899

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PROVISIONAL DE FUIFICATION.
An Improvement in the Manufacture of Viscose.
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in
the County of London, Chartered Patent Agent, do hereby declare the nature of
this invention (as communicated to me from abroad by Edouard George Peter
Thomas, Chemist, Jean Bonavita, Engineer, both of 15, Rue d'Enghien, Paris,
France, and Maurice Olivier, Merchant, of 60, Rue d'Avron, Paris, France)
to be as follows:-
Viscose, as it is usually manufactured, is unsuitable for certain purposes, such
for instance, as that of constituting a vehicle for pigments, on account of its
yellow colour, its offensive smell and its want of durability. Also, when it is
used in conjunction with a large proportion of certain cheap pigments such
as whitening, china clay, barium sulphate and the like, the surface produced
is deficient in hardness.
This invention relates to means of remedying this defect by adding to the
viscose, in the course of its manufacture, a proportion of sodium sulphite, which
removes the objectionable colour and odour, and a proportion of zinc oxide, which
adds considerably to the durability of the viscose and, when a large proportion
of the cheap pigments mentioned above is employed produces a hard surface.
The manufacture is carried out as follows:-
The alkali-cellulose is prepared in the usual way and, when the action of the
alkali is complete, the material has added to it finely ground sodium
sulphite in quantity about 25 to 30 per cent. of the cellulose, and zinc oxide
about 50 per cent. of the cellulose. By means of rollers or edge runners. an
intimate mixture is obtained.
After thorough. incorporation, the mixture is treated in the usual way with
carbon bisulphide..
The product dissolved in such a quantity of water as forms a ten per cent.
solution of cellulose, can be used for any purpose for which colourless, odour-
less and durable viscose is applicable, and especially as a vehicle for white or
coloured pigments.
ABEL & IMRAY,
Agents for the Applicant.
*ORT A
TO AINRIN URTIT OTTO TTY ATTATTOOIDITY DU
I, OLIVER IMRAY, of Birkbeck Bank Chambers, Southampton Buildings, in
the County of London, Chartered Patent Agent, do hereby declare the nature of
[Price 8d.]

page_text: this invention (as communicated to me from abroad by Edouard George Peter
Thomas, Chemist, Jean Bonavita, Engineer, both of 15, Rue d'Enghien, Paris,
France, and Maurice Olivier, Merchant, of 60, Rue d'Avron, Paris, France),
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:.
-
Viscose, as it is usually manufactured according to English Patent 8700 of
1892, is unsuitable for certain purposes, such for instance, as that of constituting
a vehicle for pigments, on account of its yellow colour, its odour and its want
of durability. Also, when it is used in conjunction with a large proportion of
certain cheap pigments such as whitening, china clay, barium sulphate and the
like, the surface produced is deficient in hardness.
This invention relates to means of remedying this defect by adding to the
viscose, in the course of its manufacture, a proportion of sodium sulphite,
which removes the objectionable colour, and a proportion of zinc oxide, which
adds considerably to the durability of the viscose and, when a large proportion
of the cheap pigments mentioned above is employed, produces a hard surface.
The manufacture is carried out as follows:-
The alkali-cellulose is prepared in the usual way and, when the action of the
alkali is complete, the material has added to it finely ground sodium
sulphite Na, SO, H₂O, in quantity about 25 to 30 per cent. of the weight_of
cellulose and zinc oxide about 50 per cent. of the weight of cellulose. By
means of a mixing mill or edge runners an intimate mixture is obtained.
After thorough incorporation, the mixture is treated in the usual way with
carbon bisulphide.
The product dissolved in such a quantity of water as forms a ten per cent.
solution of cellulose, can be used for any purpose for which colourless, odour-
less and durable viscose is applicable, and especially as a vehicle for white or
coloured pigments.
It may be also used as a vehicle for alkali employed for removal of paint, a
mixture suitable for that purpose being as follows:-To 1000 parts by weight
of the viscose solution above described containing 15 per cent. of cellulose are
added 750 parts of a 40 per cent. solution of caustic soda and 50 parts of
petroleum oil.
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;-
The manufacture of a colourless, odourless and more durable solution of
viscose by incorporating sodium sulphite and zinc oxide with alkali cellulose,
treating the mixture with carbon bisulphide and dissolving the product in water
substantially as described.
ABEL & IMRAY,
Agents for the Applicant.